I press A and just guestimate the timing. I don't actually time it. I guess I kind of know how long it's gonna take? lol.idk. Sometimes I have an off day and they keep exploding in my hand

Just make sure once you pull the clip YOU HAVE TO THROW IT or you'll commit suicide. Sometimes the person you're going to throw it at gets killed by somebody else and u just have to find somewhere to get rid of it. At port I usually through it into the water lol.