Search for the thread on pitch riding - it was around in the last week or so, if you ride the pitch more or less continuously or even every 30 seconds or so throughout the mix you can stop the tunes drifting so much. Up until christmas i matched by slowing the platter with my hand, but pitch riding i find is a lot more accurate
well get 2 vinyls. leave 1 playing and on the second find the start of the song (easier if it starts with a beat) and find the 1st point of that song. listen to the other vinyl and listen to the 4/4 beat. when the bar has ended push the other vinyl and uve prettymuch got em beatmatched alredy. just gotta edit the pitch a bit here and there and ur ready to crossfade it in
Also mate get on djtutor.com (or search youtube for 'ellaskins'), that guy has done some wicked videos that explain everything from the basics to more complex stuff like phasing and beat juggling.