Weeeelll, I just try to make something work, assuming that the design is somehow logical and/or userfriendly enough to make it work without having to read the manual.
When I'm hopelessly stuck or bored I usually try to read the instructions.
But most of the time it works using the "noread" approach. In the old days, I got a lot of games from friends for my C=64 and they never came without any instructions at all.
And those occasions when I connected devices incorrectly, they never blew up and I was able to correct it.