Originally Posted by Hondo6

Step 1: make sure you have a fat wallet.

Seriously - it depends.

If all you plan to do is have the frame refinished with new decals, then put the existing components back on that won't be too bad. And there are many approaches you can take for that, depending on the condition of the existing frame and paint.

But if you're doing a 100% restore to original, including original gear (less consumables, maybe), that might be a very different story. If there have been upgrades to the bike since day 1, finding excellent used or NOS versions of the originals may require serious cash - particularly if the original components were good ones. I recently saw a vintage used XTR hubset go at auction for around $190 on eBay.

Best of luck.