My two cents;

- don't rush (even if he's your favourite DJ)

- think before you act, 'cos sometimes you can **** up an otherwise good mix by rushing to push the platter when you should be slowing it down or the other way around; it still sounds way better if your beats are slowly drifting apart than if you jerk your record the wrong way... Also think before you adjust the pitch, because you might end up doing more harm than good...

- try listening to the two records playing as though they were one record, 'cos if it sounds as a single track, you're doing a good job, but remember which record has the hi-hat and which has the kick drum (for instance) - that way you should always know which record's speed to adjust...