Fairly easy but get a new tank seal from your Harley dealer. You will need the tank ring tool to reinstall the tank guts. 14mm hex drive for the swinging arm. 36mm wrench for the rear wheel. I've done two so far and much quicker the second time.
You dont need the tank ring tool. All you need is a strap wrench. Worked great for us (Josephthreedogs) and I did mine. Fairly easy. 2 things I can tell you about. 1st dont toss around your tssm. IF you do the bike will strt and run but it will not strt back up afterwards. So just try to keep it as it is on the bike, or atleast put it back in orig. place B4 you strt bike.
2nd we couldnt get the "mud flap" after heating it to mould right. If you have problems you can reuse that old 1 but may need to trim it or make one outta some plastic like a old trash can lid.
Make sense? Really not difficult. Just take your time. REALLY REALLY glad I got this instead of the "other" brand. Any ?'s feel free to pm me. G/L
On the D model the tank will slide out with the guts installed but the UE tank will not slide in with the guts installed, this is why the tank ring tool is good to have. I found this out on the first one, after using a strap wrench to remove the guts on the old tank. just my finding to date.