I tend to start with a good record and then play more good records till it's the end of my set. A fairly simple technique I find, I think many DJs could benefit from adopting this technique. Good records are so much better than all the bad records that many DJs seem to play, don't you think? It doesn't matter too much to me what's happened before my set, I'll blend into what comes before then break it down and create a new start point.