You can hone the small out to except the A35 roller bearing without pressing the crank apart. However, it's a majorly hard little bastard and you will burn up a couple of stones in the process. Pressing in a Puch bushing is easier and will hold up just fine.
As for the rest of your question... How wild do to want to spend? Treats has got a pretty good little party kit if you want to do it on the cheap.
You've got alot of reading to do on here to figure out what you want.