How many will I need for a 12 week cycle including hcg,I'll be the only one using them of course,but this will be my first cycle so not sure how many to order,I'll be taking test e250 twice a week, and hcg twice a week was also reading about back loading sin pins would this be ok for the test and hcg,? I've never used or held needles in my life so this is all new to me,thank you all in advance.