I have been doing sight injections for the past couple of weeks (exact same as you zboms 25g 5/8). The bi's are the freakiest. You have to get yourself psyched up to do it. Just relax and find your spot and put that dart in there. Asperate and take your time plunging. Be ready for some sore bi's
piece of cake bro! just remember to aspirate that's all. also hit both the inner and outer heads. i also prefer to use a 1" over a 5/8" so you get deeper into the muscle, but a 5/8" should be fine also.