Did a cross race the day after buying my first set 30 years ago, I would not advise others do the same.
Lucky B*. I set up my new clipless arrangement one evening and rode about 7 miles near home without a problem so I thought I'd be OK.
The next day I went on a 50 mile sportive, everything was going so well I completely forgot about the clips until I reached the feed station at a gravel car park in Nantwich and CRASH!!
Other riders gathered round me with looks of concern over their faces. One wag summed the moment up completely - "First time yup. You'll find that you are more embarrassed than hurt, and just to make sure, we're all going to gather round you and laugh" - and they did.
I'd learned my lesson hadn't I. But no, three miles further down the road and CRASH!! again, now in front of heavy traffic at a junction. This time I suffered the utter humiliation of being stuck under the bike with my lower foot still clipped in and having no way to twist it out, I was trapped. The driver of the 4x4 immediately behind completely failed to show his serious concern for me, sitting there revving his engine whilst I struggled like an overturned turtle there on the tarmac.
Eventually I managed to extricate myself and retired to the side of the road to pick gravel out of my knees.
It's a day I will never forget. Well, probably only about once a year on current averages - I'm due for one fairly soon, so listen for the CRASH!!.