As others have said, figure out where the head would be, then aim. You could practice in PvE. Sniping just takes practice. Depending on the player aim assist might or might not help. I'm better with Praedyth's Revenge which can have about 10. My 1k Yard Stare has about 40. I learned to snipe with older games with little to no aim assist. I also find Ambush the best scope for me because it has very little sights on the scope. Tacsys adds 15 AA, but has great sights IMO. 1. Find the best type of sniper for your play style. 2. Find the best scope for you. The actual sights have a greater impact for me over aim assist. 3. Practice. Start out in PvE and practice in multiple situations. Move, stay still, move your sights and combinations of the above.