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nowadays most cdjs will give you a bpm number, latest firmware even with decimals but you don't need to know the bpms nor even count them. Just move the pitch + the platter:
1.- Cue a song on beat, most likely will start to unmatch
2.- Move the platter clockwise, matched again? This song has a slower bpm than the one is playing, keep moving the platter + the pitch till it doesn't unmatch again, with a 0.01% pitch precission even in long transitions you aren't likely to touch anything but if you start feeling things are going to screw up soon just move the pitch a tiny bit again. 3.- Move the platter anticlockwise and repeat the inverse process if by moving the platter you didn't match the beats.
There are several methods, this one is for me the easiest/most accurate but it takes some time, if you need to switch between records quickly there are faster methods, but again, most likely you'll know the bpm so it's more a visual thing nowadays.
About counting bars it ends being something intuitive, it's highly advisable to know your collection very well, i often put my new tunes on the ipod and listen to them a few times every day.
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