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@lae
I'd buy the tools to do the bottom bracket yourself - you'll need a crank puller and a lockring spanner (and a modern BB cup tool if you want to install a modern BB, too). To remove the crank bolt you'll need either a 14 (or occasionally 15) socket to remove the nut, if it's nutted, or a big allen key if it has an allen bolt. It might cost more than the labour at the shop but you'll get tools to fix/reinstall plus the experience.
You can make headset remover by getting a piece of pipe that's just small enough to fit into the head-tube, then cutting a slot into one end of the pipe and flaring the end slightly - then pull it through the head-tube by the non-slotted end until the slot pops into place behind the headset cup. The flared end of the pipe should now be sitting directly on the inside of the cup - give the other end of the pipe a few gentle taps with a mallet and the cup will come out. The bottom cup (the bit that mounts to the fork) will come out if you place a big adjustable spanner over it (wrap the ends in electrical tape or old inner tube to prevent it from scratching the paint), and gently tap that with a mallet (re-installation is the reverse of removal). To install the new headset, you can make a headset press out of two blocks of wood and a fuckoff big g-clamp, or just use the mallet again. To be honest, unless the old headset is worn out, you could just clean it out, replace the ball bearings and re-grease it - no need to remove the cups.
Good luck with your project.