Shannonplussed,
I can only explain by putting it like this, I know the dosage is right for me because I feel most like my younger self.
I made a spreadsheet of my undesirable meno symptoms before I went on HRT for the second time, and rated them on a scale of 1-10 how much they bothered me every couple of months, which were as follows:
Low libido, lack of sexual response, vaginal comfort, general energy, evening energy, sleep, mental stability, joint comfort, general flexibility, stamina for exercise and flushes. The lower the score the worse the symptoms, so in Aug 2016, before starting HRT I was rating 0 on the sexual ones and under 4 for everything except sleep. Updating the spreadsheet as my treatment has changed since then has been helpful in focusing on what has improved in comparison to previous treatment, so that I know if the change has been for the better. At the moment I would rate myself between 8-10 for all categories, and this has been the case for around 10 months.
I also used the spreadsheet to take to my gynaecologist and GP to help me in explaining how over time what symptoms were originally improved, but were then not improved as much. This helped with getting treatment changed, rather than plodding on with something that wasn't working for me. With changes I gave myself 6m of settling and checked my symptoms monthly. If I'd had really undesirable side effects or worsening of symptoms I would have gone back to my GP.
I would say that if you're peri it's more difficult to get the balance right, due to the influence of your own hormones, and what might work in peri may need changing when you're post. I'm a bit like Hurdity, I started my first HRT late peri and when I stopped it around 18m later due to undesirable side effects I never had another period. I then suffered badly for a couple of years because I thought all HRT would give me the same side effects as the first I'd tried, before seeing my GP with my catalogue of symptoms and in a very desperate state. Referral to a very good gynaecologist and things have improved massively in the past 4yrs.
HTH,
S