you can fix the brakes yourself, no need to take it to a shop, chances are they wouldn't know how to do it properly anyway. as far as the brakes sticking, that sounds like the wheel cylinders need rebuilt or replaced. also try bleeding the system, might help with the spongy pedal, procedure is as follows:
bleed pass. rear upper wheel cyl.
lower pass. rear lower wheel cyl.
drivers upper rear wheel cyl.
drivers lower rear wheel cyl.
pass. front wheel cyl.
drivers front wheel cyl.
also, try adjusting the brake shoes until there is a heavy drag when you turn them by hand.
Richard
