himespau, I'm an amateur bike mechanic and I'd guess you're looking at about an hour's worth of work if most everything goes well. Prior to any adjustments make sure the derailleurs are aligned properly (height also on the FD), this will save grief when finely adjusting them both.

I have to mention that the devil is in the details, properly dressing cable housing ends and cable housing length will make things not only look correct, but work faultless for years.

Brad