My advice as simple here, roll calm. Your primary focus should be your objective, not how hard you're gripping his collar; if you have to grip it hard, you grip it hard and if you don't, you don't....
Thanks for the kind words :) I find that if I underhook the leg I am able to apply more pressure to the choke (as it increases leverage), however it is risky because you're not actually attached to...
Nice username haha. Whenever I'm in half-gaurd I nearly ALWAYS look to pass. I'd only look to sub someone from that position if they were just giving me easy things to grab.
Here is the link to my Hookit profile: http://www.hookit.com/members/jacobsbjj/ I'd really appreciate it if some of you would take the time to click the link and follow me :)...