i've had to do this alot after drum and bass dj's where the crowd are totally into the d+b sound. basically make sure no matter what, you let the guy's last record play out - it's a sign of respect and the crowd notice shit like this. also shake the guys hand, make it out like you appreciate what he's done cause if the d+b see this they might just be prepared to give your music a chance too.

Then (and this is important), make sure there's a good gap of silence between his last record and your first.

Then off ya go, just do your thing and hope for the best. I've found recently that playing your first track of CD and making sure you've mastered the hi's up can help too after d+b cause alot of these guys play worn out dubs.

Anyway hope this helps :)