Congrats, man! I hope things go well for you! First week for me was most noticeable in that I started waking up earlier. Like, considerably so--not going to bed earlier or getting out of bed in the morning earlier, exactly, but I pretty consistently started waking up before my alarms went off. I casually daydreamed about doin' the do a lot more (usually in that time between waking up and alarm telling me to go off), as well. Hunger spikes are pretty common, energy spikes are pretty common. I have a mood disorder and my mood "ranking" shifted around a bit--what pre-T would've been a 3-4 out of 5 on the depression scale was ranked at 2.5, which was interesting.