Stickers are easy:
I did this on a Ducati's fork reflectors, and frame stickers.
Warm up the sticker with a hairdryer, don't let it sit too long in one spot....then gently lift a corner while still blowing the hot air on it. Gently peel it off.
I immediately took the stickers (glue still warm) and stuck them on a piece of paper in order to save them, and flattened them out nicely. Kept them in my compartment under the seat in a ziplock baggie along with the registration and insurance card.
Then use GOO-GONE...it works wonders but might leave a little residue. Just wipe it clean with windex, or just wash the bike well and finish with wax!
Left no marks on my old Ducati Monster 620.