I have not done it on a 1500, but, I have done it on an1800.
It's a fairly involved job, mostly tedious. Took e about three days, probably about 3 hours a day. It was January, so my hands got chilly and I'd quit for the day. You basically need to take off most of the faring ... LOL ... if you re gonna do this, I recommend doing the air cleaner while you have it that far apart.
If you're not used to messing with the gold wing faring, watch some U-tube videos, take pictures as you go and mark everything you take off. There are many screws of different lengths, it you don't mark where they came from you will be guessing when you put it back together. The longer ones will go where the shorter ones should, but, not visa versa. If you use a long one where a short one should be, two things will happen, you won't have enough long ones, and, you might be hitting something with the excess screw length. Also, be careful with the electrical connectors, especially in a 30+ year old bike, they are plastic and do become brittle (the clips that hold them closed). Use dielectric grease when putting it back together. Be very gentle with the ribbon wire to the LCD.
Not trying to scare ya, trying to give you information that will make you successful. The dealers get between $300-500 in labor alone to do this. So, take your time, document everything and you should be fine if you're used to wrenching on a bike. I'd figure a full 8-10 hours maybe more if you take your time.