Well 1.5 grams is IMO a low-ish dose, and that is about the lowest dose I will personally be able to feel at all, but for some people they consider that an average dose.
If I were to take anything below 1,200mgs MAX I might not even know I was on it.
I start to feel it around 1,800mgs but I still feel that is low, and as mentioned, my sweet spot is somewhere between 2,400--3,400mgs, but many people say that is a very high dose for them.
I have found my optimal dose to feel good and sleep well without having trouble waking up the next day is 2,950mgs.
Some people like to stagger their doses, and I often do, but not because I feel it works better but only because I am not always sure how much i want to be on, but if I know how much I want then I don't stagger and just take that dose right away.
Like the other day I just took 2,950mgs in one shot and was good and did not re-dose.
But being that you are new to it I very much think staggering is a good idea, especially with how long it takes to feel it and to peak and how long it lasts, because since it lasts so long you don't want to end up being on too much because you jumped the gun.
I would take it slow and expect each dose to really kick in after about 2 hours and only take more if it's been like 3 1/2---4 hours since your last dose and you still want more.
I ended up so far taking 3g. Doubling second my dose (not the smartest move but I have an idea of what I'm going to expect with this) and having ~30g of kratom. Had 2mg alprazolam as well. Now for some ice cream. I'll write a TR later because I have not done so on BL yet, its been a while since I tried a new substance ?