man i just pined my bi's for the first time last week,,,,,,,,,,god damn i couldnt lift my arms for days (but it gets better, its usually like that the first time you pin a muscle group)
flex your arms, find the middle fo your bicep peak, go in there,,,,,,,,,,,,,i only have 18 inch arms, so i used a 1 inch pin..............start with 1cc and work your way up