What I wish I would have known right when I started TRT
That Pregnenolone wouldn't cause any issue with e2 leves, but DHEA might. Pregnenolone appears to be enough, and should be supplemented. I started to barely develop gyno because my e2 levels were getting so high, because of dhea. I dropped the DHEA and now e2 levels are very manageable with out a true AI.
You can use Calcium d-glucarate to moderate e2 levels. Dose is 2000-3000mg a day. Pair it with DIM at 200mg-300mg a day and you shouldn't need to use Arimidex. I'm managing with our Arimidex and my Test levels are at 1010-1020 at trough.
Don't get on it if you don't need it. I was low normal, and I still went on, because I didn't want to be low normal, I wanted to be optimal, and I was feeling the side effects of lower testosterone levels. If you're 600-700. Don't even bother. It is an added chore injecting Test, and HCG twice a week, but once you get into a rhythm it fits into your day like anything else. I am a disciplined person though. If you aren't, you need to re-evaluate before starting. You need to be disciplined.
It may take you a while, and a number of blood tests regularly to get your levels dialed. I would have been dialed in sooner, except for the DHEA was throwing my e2 off. I probably would have been dialed in 3 months if it wasn't for that. Now it's been more like 5-6 months. I'm waiting for my e2 results right now. If they are still good, then I'm pretty much dialed for my normal protocol. It has taken some people upwards of a year to get dialed from what I've read.
My other advice would be don't just look at your Test levels you need a CBC w/Differential, look at your Thyroid, growth hormone, all electrolytes, cholesterol. Look at everything that effects general health, and metabolism. While I'm not overweight my thyroid was hypo. Getting that fixed right now. Doc is upping my prescription currently for a compounded T4/T3 med. I am already started to notice results. I wasn't overweight, but getting to the level of lean that I want to be has been difficult, it seems to be getting easier and easier as my metabolism is getting optimized. I'm looking forward to being able to achieve goals that it always seemed like others could, and I couldn't.