Try not to stress, even though I know its hard not to. The problem with tuning is, nothing is concrete. A set up for one archer may very well not be true for the next. It takes time and patience. Dont rush,or things just seem to get worse. Many think tuning is useless unless a good solid release has been developed. Otherwise, just the (poor)release alone can cause poor arrow flight...so tuning is kind of useless at that point. Form and release can take quite a while to nail down....some cases years. Personally, I always suggest that the shooter use charts to get close, and just go out, start shooting and have fun. Start working on one aspect of form to begin until its happening the same way every shot....then tackle the next aspect of form and repeat and so on. Just have fun, no stress, no hurried feeling. ..or failure is a real threat.
If you still want to try to tune arrows, If you dont have a saw to cut carbons with, maybe starting with aluminums might be better for you. A cheap small tubing cutter works fine if its sharp and you go into it very very easy, so as not to egg shape the shaft. Ive done a slew like that. Ive killed many deer cleanly with aluminums and trad bows.
Just take one question or concern at a time, and ask about it. There is tons of help here on TG.....some of the very best around are right here, and willing to help. Just be specific in your needs.
If I can help, I certainly will. Ask away here or on private message.