Being sneaky,I guess,would encompass both stalking and still hunting.If you are serious,I believe being sneaky starts when you are preparing equipment,pre-season.
Clothing
Some of the quietist clothing would be wool or fleece.They may not be the best for pants if you run into a lot of burrs,but use the most quiet you can get.LL Bean uninsulated packs are excellent for quiet travel.They are as quiet as moccasins,have better traction and can get you through mud,muskeg and shallow stream crossings with dry feet.If possible,choose clothing that doesn't have large buttons in areas that may bump the bow or binoculars.Check metal zipper pulls etc for noise.
Bow
Everyone knows how to quiet a bow.Don't forget on recurves that when drawn,a waxy string at the curves can make a small noise.Some say remove the wax.I say use a well waxed string and install Bow Hush.Your string stays protected but no noise from wax plus string slap noise is reduced.
Pack
If you carry a pack,make sure there are no noisy contents and of course go over zipper pulls etc..I personally like to roll up any dangling excess straps and tape them so that excess doesn't flap in the breeze.If you stalk in the wind,it can be like 5 or 6 little hands waving"here I am".
Sneaking
It's a good thing to have face and hands covered,probably more important than when in a tree.Some say put the ball of the foot down and roll the foot back till the heel is down.I think just starting with the heel and rolling the foot works as well.You just have to hope that your foot gear lets you feel any invisible twigs.
Fred Bear said take one step and stand still for four.I think that's pretty good.At any rate,if you are to ever fool a deer,you have to spend more time looking and being still than the deer does.Think about that.99 % of the times you get busted,will be while moving.That is why stand hunting is so effective.
If you snap a twig,it helps to use a call-turkey call,squirrel call or cow elk.Have it at hand.Stand still and give it a rest for a bit.Rythm of your steps should be broken up if there is any noise.Two legged animals sound different than four and animals recognize it.
A tool that has helped me a lot is a small pair of pruners.I carry them in my right hand jacket or pants pocket.Especially in brushy areas,you may have to push through or bend back limbs in the way.Some limbs are dead and noisy.I can still hold the bow in my left and quietly snip a branch with my right and keep moving forward.It sometimes keeps me from having to squat or crawl under something,creating extra movement.It helps a lot.
A small pair of binoculars in the 6-7 power range are invaluable in picking through brush ahead for a part of a deer,an eye,an ear or maybe a lower leg.I prefer a lightweight pair and shorten up the strap so they sit right on my chest.I then take a piece of 3/8" wide elastic and sew or tie it on one side where the bino neck strap attaches.The other end of the elastic is fastened to the other connection point.It now looks like you have two neck straps,but the elastic goes around your back and keeps the binos close to your chest and out of your way when you need to shoot.On your chest,it is just a short,one handed movement to get them up to take a look.With lightweight binoculars you don't need a bulky bino harness.The simple,elastic strap works very well.
The Final Stalk
Deer and other animals recognize an upright form very quickly.Even bears can pick up on it quickly from a distance.Getting low helps a lot.If your boots aren't real quiet or don't let you feel the ground,you can slip them off and put on a heavy pair of wool socks and proceed.
A word of caution here,if you drop your boots and or pack,you have to be able to find them again.I know that sounds like a no brainer but when you are focused on moving forward and later have to reverse course and come back,everything will look different and I have had deer move and take me much farther than I expected to go.I read a story recently of an elk hunter that never could find his boots and had to walk two miles to the truck,in his socks,through cactus country.It could happen.
I never lost mine but I have had a few scares.It might be worth tying a piece of surveyor tape at a visible level,lean a pole against a tree,rock marker,GPS-something.Just have a plan.
As you move forward in a crouch,it may require you to pick leaves or rocks from the next spot to put your foot.One at a time you can make a smooth spot for your foot,if needed.When close,I have often sort of crab-crawled,keeping my left side forward and bow in left hand.My right hand acted as a third leg.From there,I can ease up into a low kneeling position and shoot.
Well,good luck.It's a tough way to take a big game animal but still very rewarding,even if you don't.