Installing a top isn't that difficult but you need to go slow and watch carefully what you're doing.
First, the 3 alloy strips that hold the top to the back of the cockpit and run along the side should be fastened with pan head sheet metal screws about 1/4 inch or so long. If it has rivets now, someone probably replaced it in the past. You'll also want to have a couple sewing awls or equivilent, screwdriver for the retaining screws, spring clamps to hold the back alloy strip and top to the body while starting the first couple screws and the top to the frame, 1/8 inch dia rivets for the front bow and a bit of chaulk.
What I've done is this.
1 First, remove the seats, it's much easier than crawling over them. Put the top frame up and adjust it to the door windows and windshield frame.
2 Find and mark with the chaulk the center and a couple other holes in the body for the alloy strip. It's easier than trying to find them through the top material and weatherstrip. I mark the drain channel edge so I know where to start. Make a note how high too.
3 Lay the top over the frame. The rear window should be centered and the trunk hinges the same distance from the vertical sides of the window. Use 2 of the clamps at thos point to hold the top to the vertical portion of the fram behind the door windows. Use another couple to hold the front to the front bow.
4 Crawl inside, position the rear alloy strip using the chaulk mark then the awl to punch through to the hole in the body. You may need to feel around for it and if it's too far off the location of the strip pull it out and relocate closer to the hole. Once it's in place use a clamp to hold everything. Using the holes in the alloy strip use the second awl to find a body hole a little ways away on each side. Remove one awl and insert a screw. Do the same thing until you have a couple screws on each end.
5 Once the alloy is held in place by 3 or 4 screws you can remove the clamp and use one awl to find each body hole then drive in a screw. Remember that the rear strip retains the top, the side ones do not.
6 Once that is done you can fasten the sides to the frame, There should be a fabric covered strip on each side with 4 screws through them. The top is sandwiched between them and the frame.
7 For the front bow, mark where the top folds around the front edge with the chaulk. Then lift it up and attach the fabric to the front bow. I usually pull it a quarter inch beyond the chaulk mark to allow for the fact it'll stretch a bit at first. It should fasten under the C channel for the front weatherstrip so those rivets will need to be drilled out and replaced.
That should get the top on. Now, this doesn't address things like earlier tension cables or later velcro, the straps on the frame to prevent sagging, or deatils on getting the frame to fit first. It's just the basics but you should get the idea from it.
