I don’t know about disguises, but you should be prepared to defend yourself. If Clu was able to reprogram Rinzler to fight for him, it’s likely he’s done the same to the other programs in the system as well. [It’s a chilling thought: how many programs like Tron had had their personalities completely rewritten to serve Clu’s purposes?]

If you want more information, you should ask Tron or Sam: they’re the ones who have been on the Grid before.