You can start at 2.5mgs from the get go. The op was 2.5mgs two times a day for a total of 5mgs a day. What i did was 5mgs for 15 days then I began the taper down process to .25mg day then once you are at that dose for a few days move it to .25mgs eod for a week, then .25 twice a week for a week then begin adex(stane) the day after your last dose of letro at 25mg day for a month to prevent estrogen rebound. Do this and you will be good.
"you will never be happy with your results, but that shouldn't deter you from trying to obtain your goals"
~Me