go slow man, the trick is detail. everything gd is in the details of how do u do it. dun auto pilot when u prac, pay attention to the sound and ur hands movements. like tai chi when u go slow and make sure everything is working like it should.
ur left is normally weaker, so look at ur right handand try to mirror wat ur right is doing. remember to stay relaxed and loose. hit the same spot on the drum first, make sure u can do tht. when u can hit the same spot without thinking, and the sound of the strokes are even.
after thiss start to play with ur hands apart to find diff sounds.(this is just the snare drum by the way. also have a metronome dude.
place the metronome on 60 and just play 8th notes, then move on to 16th.
on 16th notes u can't slip up cause once ur out u can feel it. do this on a drum pad not a drum cause u need to be able to hear the notes cleanly without the over ring of the snare, or u can place the pad on the snare.
once u can play 16ths accurately and cleanly, take the click to 4th notes and play 16th over it and u find tht u will be very on the click and not slip at all.
after u can do 60 on the click start moving up the speed. keep relaxed it will take u anywhere from 3 to 6 weeks if u spend an least an hour a day. i recommend 2hrs if u can. STAY RELAXED ur band members will apreciate it cause u'll not sound harsh. be like waterrrrrrrrrrrr(bruce lee said)