i just did mine yesterday for the first time. it was easy. but as i learned you should expect to make adjustments to the H and L limit screws even if no wheel/cassette is installed. it was my assumption that it would shift fine with no cassette (but not in the correct places), i was wrong about that. because i had my chain off at the time i put the wheel/cassette back in and made the H and L adjustments. after putting on the chain it was very easy to make slight barrel adjustments. the hardest part was getting a compatible RD to replace my old Sora 8 speed.