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While I agree that it wouldn't be worth the expense to rent/buy/build a mechanical plucker for this many birds, I wouldn't recommend doing 20 birds all at once your very first time. Do a test run instead with just 2-4 birds, and familiarize yourself with the process of processing.
Do all your homework, collect & assemble all your tools & equipment, chill some refreshments for yourself, and process just a few birds for practice. We all hope it will go very easy & well for you, and you'll be eager to finish the rest of them soon.
However, there could be technical difficulties you might encounter your first time, and it would only be worse if you had 19 other chickens lined up & waiting for you that day. My processing pal & I always figure ways to make our next session go even easier, we always learn ways to improve our set-up & technique.
Another benefit of doing just a few birds to start with for practice is that you will have time to rest & cook them, and taste just how wonderfully worth the effort home-grown chicken really is, before you tackle the rest of the group. It could also tempt more of your friends to come & help with this chore.