Some good advice. From what I can remember when I was in your position (recently) - practice clipping / unclipping while sat on the bike and propped up against a convenient support (wall, work surface etc).
Make sure you're conscious that you're clipped in and remind yourself when slowing down to come to a stop as this is most likely where things will go amiss if you're not on the ball. Try to remain aware all the time you're riding though, as the occasion I've come closest to falling over through failure to unclip was during an emergency stop when my mind was obviously prioritising other stuff.
Good luck - tbh 18 months down the road and I'm not 100% convinced of their superiority and still get a bit of anxiety about being attached to the bike. Then again I get anxiety about getting out of bed in the morning, so I'm sure most are fine after a few months' acclimatisation
