it won't kill ya but i dont think u will get much results of winni only, imo. i never really felt much strength gain or lean body mass by itself. i think it is more of a cosmetic compound that really "dries" you out at lower bf. with that said if you are strictly looking at losing fat you could go a little calorie deficient, hit the cardio, take winni as an anti-catabolic so you preserve your mass.
6 weeks will do though u may be a little short. i feel u need to take 75mg of the oral to compare with about 50mg of injectible. which u only have 33 days worth (9 days short). you could run 50mg ed for the first 2 weeks and then finish out 75mg the rest which would put u at 42 days (6 weeks) and have 2 tabs left over.