Aside from my 1st pin in my glute, that was the only real pain I've experienced. And as for going in, its actually not painful at all, I've had a little bit of stinging, but nothing too severe. I was going to buy Test400 initially, but read so many post about the unbearable pain that I'm glad I didn't now lol
Are you currently cycling? From your profile pic you are looking huge for 21 dude. Keep it up!