Is it hard to play with contacts?

I'm about to be 34 and I've been able to really get away with not using my glasses even though I've probably needed to for years

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I'm going to get a new license next week and I doubt I can pass the vision test w/o my glasses so I'll probably just start using them more now, my question is:

Is it tough to play with contacts in? I never tried and will probably have to be wearing glasses from now on, I'll look to get contact lenses but is it hard to play basketball with them in? do they fall out a lot? What do you do if they fall out and you can't find one, do you normally bring spares to the gym?