probably the easiest ways to cheat are either use a protractor to sketch out a 22 degree v on paper, then look from the point down your blade and see if it looks close, or take a square of paper, fold it diagonally in half, (that gives you 45 degrees) then fold that diagonally again, that gives you 22 1/2 degrees, that's good enough to get you on the on the map (as a master cabinetmaker I apprenticed to would say, good enough for a church)
I found my angles mostly by by experience, and seeing what really worked and what absolutely didn't. Cold chisels have a 90 degree included angle, you can sharpen them as fine as you want, you're probably not going to be able to shave with them, straightrazors have something like a 10 degree angle (just guessing without measuring) and cut like nobody's business, of course I wouldn't want to be chiseling steel with one.
If you want absolute certainty as to what your bevels are you can spent a whole lot of money on machinists' tools, Personally I would use the methods I suggested as a guide and wing it. Spend the several hundred dollars you save on Wayne Goddards $50 dollar knife shop book and a good belt grinder.
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