I think I have done most of that which was mentioned, especially the letting of blood.
KKaa, I trust the door and rear fenders are not already installed as I believe the front fenders, after the front and rear shroud, should be the first side panels installed. Following the slightly loose installation of the upper fender bolts, I like to insert the bead, bending a minimum of tabs to keep in place, after taping the tab ends (nipping off the tab edges, as john suggests, seems a good alternative to tape) and then I install the door.. With the door snugged in place, I adjust the fender for best alignment of the curve and with even door/fender spacing. Once a best fit is achieved, I will start to tighten a few of the top bolts and install and snug the bottom bolts with an eye to maintaining curve alignment and even door/fender spacing If the door spacing changes, I determine whether shimming the door hinges or refitting the fender will solve the condition and then follow through. Once I am satisfied with front fender/door placement, I then install the rear fender relative to the door and follow a similar installation procedure.
Keep in mind that the original body panels were never perfect and the fit from the factory was best effort if you were lucky. When accepting delivery of my brand new 64BJ8P1, the height of the passenger front fender was more than an 1/8” higher than the door but the curve alignment was perfect. Today, perfect panel fit and finish are achieved by the body guy who modified the door or fender to produce consistent spacing and flat panels.
I am always amused by the perfection of restored Healeys and hearing their owner claim being as original when all panels are perfectly aligned and finished in modern paint and clear coat.
Enjoy the pursuit,
Ray (64BJ8P1)