We should have this be a very full and informative section of the FAQ/Wiki for this. There should be lots of different options that explain the whole process from start to end, and what the pros and cons are for the different methods.

We need to keep in mind that a lot of Steemit users have little to no exposure to Bitcoins, exchanges, etc. I've helped a few of my friends through this process, and know from their experience that this aspect of Steemit cam be overwhelming.

Also, detailed steps to go between all the currencies should be there. Steem->BTC->USD. USD->BTC->SP. SBD->Steem->SP. (etc.)