Hey P. Skrk
I can't speak from my own experience but I can relay some of what I've learnt from others.
General advice is you shouldn't move naps or core during adaption. Later on, you can change your schedule. It's usually recommended to do it gradually. Compared to uberman, though, your schedule needn't be as rigid. You can probably get away with postboning a nap by half an hour, every now and then. Best to avoid it though.
Also, no polyphasic schedule is easy to adopt. Different schedules, which have yielded success, should include Uberman, Spamayl, Everyman (E3, E2/E4,5), Triphasic (3x90min). People have been the most successful with E3 and Uberman. The least stressful has been claimed to be the triphasic.
Nap quality and falling asleep quickly matters. Getting used to napping with biphasic, beforehand, would certainly benefit in that matter.
There's also quite a bit of material available if you google polyphasic. As of currently logged adaption attempts, there's an uberman adaption you can follow. It's a good blog:
http://schneidera.com/polyphase/2011/12/14/
Best of luck!