In Genreal : before you open the fader on the mixer your records needs to be straight.... A tiny small correction can be made if you discover that your records are a tiny bit off-sync. Just be aware of the moment that you make this little correction, the best way to hide it a little it to do it on the 4th beat of a bar. If you lower the right channel fader a little bit while you do the correction, hardly anybody will hear.
For
vinyl : A records is put at the beat and sweeped with the right beat, on the right moment you just let it go...
For
CD : I use a different technique for CD mixing,.. the
CUE button. I use the
CUE button as some sort of sampler/stutter... Tapping it at the first bear of a measure and holding it untill if goes offbeat (max 8/12 beats), then make a correction with the pitch slider and tapping the
Cue button again on the next first beat of a measure. The first few times I hold it for max. 4 beats, this gives me enough info to make the proper corrections.
When it comes to a near-sunc-situation I start the track at the first beat with the
Play button and do the stuff you're used to with a vinyl deck (pitch bending with the jog).
Just my piece of thoughts

I can do a better description if you don't know what I mean by this... let me know..