i'm not sure what you mean by honda or diy but it is simple to do and all you need is a comp gauge which is buyable at most auto stores, you can pull a search and get all details, but the jist of it is pulling a plug, inserting guage, and spinning over, making sure of course you have a good charge on batt. you should get an even psi reading across the head, with no variances over 10 or so from cyl to cyl.