Place your thumb and for finger around the shaft of the syringe plunger to prevent OVER injection of the A.S.then inject a very small drop on to your cpu. after wiping it with alcohol. Then use a flat wooden tooth pick, (don't use your finger,to greasy).to smooth to a very thin layer. Good Luck!
I prefer to place a small amount on the cpu die, and then place the heatsink in place and press it down and move it around slightly.to displace the excess. If it isn't VERY thin, I will wipe the heatsink and press it down again. You want a very thin, almost transparent layer. If it is still bright white after it is spread(assuming white grease) it is too thick.