The swap should take less time than posting here.

With that out of the way you will find that boot managers are a good idea for this and that nuttiness is the rule when it comes to multiple drives and OS installs. I have yet to find the "best" solution so I go stock for now. I'll install UBUNTU so I have a relatively easy boot manager that has a gazillion pages about use, repair and troubleshooting. It also gives me access to files and more if some OS fails (I can boot the LIve CD!)

So that's my advice. Use some boot manager and learn about Live CDs.
Bob