RE: Making the move from epub to kindle if poss how?
Fully agree with what J.S.Egan has just posted, for books you've bought for your own use, I don't see why not. I've bought some books from Books on Board because it was cheaper than Amazon, and converted them to read on my Kindle. I have only read one of them so far though, but the formatting of it was fine.
Generally speaking, unless you have bought a book that is specifically DRM free (and most aren't), if it's an epub (bought from places like Books on Board, Kobo/WH Smith, Google Play, Waterstones etc) then it will be an Adobe DRM epub. And although you download the book from the shop you bought it from, the file you download onto your PC is often an .ascm file which opens in Adobe Digital Editions and that in turn gives you the actual .epub file that you can then put onto your ereader.