forgot to add something.
when you swing forward don't go full speed. go slow to medium speed but on the slow side. then when you feel the racquet go backwards and the butt is pointing to the ball then go fast. otherwise your swing won't have the correct shape. it won't resemble a tennis swing at all. so go slow, loose, racquet falls back and head is pointing to back fence, you'll feel this, then accelerate. don't jerk or yank it at this point. just accelerate. as in build up speed. but quickly.
Yonex VCore 100s - SW 351 6pts HL Tour Bite / Luxilon 4G 16 @ 51lbs