>>6664No problem. Another advice I can give, is to have a couple of safe signals besides the safeword, especially if you're into some activity that won't let you talk. Also, if you both agree to try it, use the safeword just to test him, even if you're not uncomfortable, but it's good to make sure that the other person will stop no matter what, if that's what you want.
The aftercare is also very important.
I don't know what else to tell you right now, just take care and don't forget that a sub is supposed to have fun too.