As I'd said, Pioneer/Barnes. Most local parts houses should be able to source them for you.
A pilot bearing/bushing will come with a clutch kit, or will come separately if you need one. As I recall, it's more of a bushing than a bearing.
Flywheels that are machined with a "step up" or a "step down" to the friction surface should not be machined - but flywheels which are machined flat should pose no particular trouble. That's a simple grinding job - nothing more.
Oh - the difference between a "professional" and an "amateur" is just a paycheque - nothing more. A "professional" does something because he is paid to do it - an "amateur" does something because he enjoys it.
This results in many amateurs excelling professionals at the task at hand. Sometimes, you run into an amateur mechanic who turned professional - the best of both worlds. They get paid to do something they enjoy doing. These individuals are rare - and you should foster a good relationship with them when you find them.
When it comes to skill, use the words "novice" and "expert" - if we're all going to use the language, let's all use it the same way. The mass media has done a wonderful job of corrupting English, and I find myself swimming upstream trying to reverse their work every day... If I hear the word "tragedy" misused on the news again, I'm going to shoot somebody...