Roy,
I hold the bow with my left hand while I spray. I start at the tip and spray to the middle of the riser, then I flip the bow over and spray from the riser to the tip. When I get close to the tip I hold the hanger. I wear gloves so I don't get oil on the bow.
Keeping it dust free is black magic. I start by cleaning the shop really good with a shop vac. My shop is split in half by a bearing wall so I have a clean half and dirty half. The clean half is only for glue-ups and form storage it also has the spray booth.
I put a box fan in a window in the dirty side and push air into the shop, through two 16"x25" filters in the spray booth wall, and outside through a vent. The door into the spray booth is located directly across from the outlet vent so any dust that follows me into the booth doesn't get to the bows.
I mist the floor with water and turn the fan on for about 15 minutes to clear out any dust. Before I spray the bow I mist myself with water, then hope for the best. It's really easier than it sounds, I will post some photos of the spray booth. It wasn't expensive to build and works quite well.