Vibration can take its toll on bolt holes, rivets, and braces. When removing, the forks often need to be dropped from the steering yoke. And if there is a painted headlight cover, the headlight usually needs to be removed. Unplug it, and the headlight cover normally sneaks off the mounting brackets, with the wires exiting through a hole in the rear of the cover. As tank removal becomes necessary, check the book and take a real close look at the component.
Some tanks come off easily.
I had become intimate with simply flipped its seat when unlocked, and the tank fastened via a rubber holding bracket at the rear. Two sliding rubber pins fastened the tank into mounts at the front. With a flip of the rear rubber, the tank slid rearward and came off quickly. But remember that the fuel lines must be disconnected and plugged before completely removing the unit. On the other hand, some bikes don't play by our rules.