It's all individual, I feel comfortable without caber at least at that dosage but many people don't and it's the same with the estrogen, while I do need an ai I never use more than half the recommended bodybuilding dosage.
Tren should probably start doing things pretty fast, 2 weeks you might notice a change and 3 to 4 quite a lot, week 8-12 you could end up seeing a massive difference to your physique. The thing is this, if you ask how much muscle can I build in a month naturally nobody would be able to give an exact answer, just like they won't be able to tell how you look after a cycle. The diet with your starting physique plays a big part. If you're skinny, fat or maybe quite athletic.
dosage, if you stack tren with a bulking steroid etc will also play a big part.