you're not gonna "feel" it like like a light switch turning on... its gonna be more subtle. you'll notice pumps, strength, intensity in the gym that are beyond anything you'd experience naturally - that'll let you know its working.

with the test cyp, it'll take several weeks before you hit peak blood concentrations but even with long esters you're gonna get a nice spike in test levels over baseline relatively quickly (1wk or so). eat, lift, rest... you're in for a ride