Easiest way to install grips...use some sort of adhesive and compressed air. Apply adhesive, put the grip onto the end of the bar, apply air between grip and bar, the grip should slide right over the bar for a tight fit without having to wrestle it on. Hope this helps!! (Don't forget to use safety wire in two places once the grip is installed)
Last set installed I used the electrical tape method.
Stick tape around bar, bend tape over and come back around exposing sticky side out. Spray Contact Cleaner on tape, immediately slide grips over tape. Let sit for a few.
No safety wires or anything else needed. Grips hold really tight.
No glue/adhesive, just 3 safety wires twisted tight on each grip (most all grips have 3 safety wire grooves and an opening to tuck in the twisted up end). Never had one come off on our two bikes over the past 6 years.
We avoid glue because if you rip up a grip or bars and need to change out the grip in a hurry.... glue sucks.
WD40. Like lube when you first spray it on but like glue when it dries. Survived many rides in the rain with no slippage. And its the easiest way to take grips on and off without a mess on the bars or cutting up the grips.
Glue is an unecessary hassle. Get some good grips with 3-4 safety wire grooves, get a pair of safety wire pliers, and be done with it. Easy-on / easy-off. No old grip material/glue to scrap off.
My vote is for the electrical "friction tape". I use safety wire also, just because the pliers are so much fun, but the friction tape alone is great. Before I got my safety wire pliers, I only ran the friction tape...I never even had the end of a grip start to twist.