Trust me, you do need an outfitter, and you need to contact fish & game for your non res. license. If you have chosen an outfitter, you will apply for your tag through him, and your almost guaranteed a tag.
That is rough country, and unless you have all the pack equip. and camping equip. it will be a ton of work before, and after the hunt. I would certainly recommend an outfitter for your first hunt in the BMW, and once you get the lay of the land, and get comfortable with the potential for Griz encounters etc. then you can at least make an educated decision for yourself.
As elkwidower said, if you do kill one, then you better watch for the bears. One guy I know that hunted across from our house in SW Montana a few years ago, only got out with the two hind quarters, and felt lucky to do that. First the wolves were there withing 30 minutes, howling etc. but never got real close. He left to walk out with plans of returning the next morning to finish the job. Upon return, the elk had been drug 50 yards from the spot he left him, and covered up somewhat. Griz tracks all around. So, he and the friend he brought back with him got the hind quarters, and got out.
Obviously that is not the norm, but the Bob is probably the most likely place in Montana to have an encounter.
Wish you luck, and hope you have a great hunt.
Just my opinion!