Yes, squeeze way before, when you're starting to come you've gone past your point of no return.
And my first reply stands true, after some this squeezing technique, do release, you don't want the stuff going back inside of you, it's not good for the tubing / plumbing.
When you do a good release there shouldn't be any issues.
Considering if you were with someone else, squeezing when you're already cumming defeats the purpose in a certain way, pause before you hit that Point Of No Return mark well in advance.
Most guys count from 1-10, remember to breath and be in sync with your body.