I've got all the parts to (hopefully) fix this seemingly mysterious oil loss issue (It's gotten worse by the way). I was quite confident I'd have no trouble so long as I moved slowly and carefully. I've got guides, guide seals, and valve seals. Im seeing in the clymers (will refer to page if needed) that installation requires several special suzuki tools. How required are these tools? Tips/tricks? Im especially concerned about the "valve guide reamer". Have any long time members replaced these items?

Unless you anticipate doing the same job again, maybe just weigh the cost of the tools vs. taking the head into a machine shop and have them install the guides for you.