You MUST learn to read plugs to become any sort of 'decent' tuner. Learn under the tutelage of someone who knows what they are looking at, AND, is willing to show you what to look for.
Racers are by and large a friendly and helpful group. As long as you are patient and don't ask at a bad time, most would be willing to help you.
BUT, do your homework just the same, by reading the suggested information . . . . . .
Fordboy