Funny that my next project is a '72 Bay, sitting in storage...
Totally absolutely doable by yourself as long as you are methodical and meticulous in your organization. Unless you've got the bread to have someone do it for you, I wouldn't. It doesn't even take that long.
I used the Yamaha carb cleaner, dissembled completely, used coffee cans to dip, kept all the parts together from each carb in a separate cheapo sandwich baggie and took a volume of pictures at each part of the process. Like this: take out screw *snap picture* take off cover *take picture* and so on, so forth. I ordered the gasket kits from Honda which are going to run 40-50 bucks. I used all the other old parts except I got new screws from Honda.
A carb synchronizer will range from about $50 to a bit over $100. Heck, the Morgan carbtune is only about 80 dollars shipped from the UK, or a four gauge on Ebay for about $60 with free shipping. The long hollow carb tool is very handy and can be bought online quite cheaply too, and then there's the float level gauge. I guess the sky's the limit eh?
You'll end up with this. Don't be frightened! It looks like a mess, but left to right is carb 1-4 with each's bits.
