First you DO it and then — and only then — will you know HOW to do it.
.. and — perhaps more importantly — you will know that you CAN do it.
(Instructional Designer’s version: Replace the word “you” above with the word “they.”)
Today I ran a session where people had to stand up and perform an intimidating task they never had done before. The hardest part wasn’t doing it… it was gathering up the nerve to stand up and commit to doing it… from that point forward, the task itself (and the instructor) carried them forward.