first non-quad inject

just broke the ice, i was always scared to inject anywhere else cause it felt akward and im not very flexible, but i just went 1.5cc in delt with prop(bd), which was easy and painless, i think people over-play the prop pain, and i went 1cc with tri-tren in my bicep, easy spot to hit its sore now though, thats my rant lol......oh ya a question, is a 5/8 good enough or would a one inch be better for those areas? could i hit my bis twice like lower and upper?