Re: *%$^ Bait Casting Reels! LOL
HAV2FISH's tape method works good for not getting a nasty backlash. The trick to casting well is to "feather" (lightly touch) the spool with your thumb during the cast, so it does not blow up on you. I usually feather the spool a couple times during a cast (if needed), then stop the spool when the lure touches down.
I have 15-20 baitcaster/conventional reels and they all cast a bit different. The easiest ones to cast have magnetic brakes and I can cast those with little thought about spool control and getting a backlash. Heave back, let it rip, then stop the spool on touch down. Though, there are not many reels with mag braking. Your reel should have centrifugal brakes in the left sideplate, set them all on while learning.
Before casting wet your line, or make an easy cast to wet the line. Casting heavy lures is easier than casting light lures. The size of line and lure should be matched to the size of your reel. Practiceg in your back yard or at the park 15-20 minutes every night for a week, after a week you will have it mastered.
What reel are you using, rod, line, lure weight. As JB said, if you are trying to learn on a cheap reel you are going to have a difficult time.
On tip, when you are trying to pick out a backlash, pick it out from the back side of the reel, not the front side. The level wind will get in your way and make it difficult to pick out the backlash.