Hi japple
There is a very definite placebo effect. It is strong in many different areas. In depression for example people often feel better as soon as they are on medication, yet it usually takes 4-6 weeks to have a chemical effect.
In accepting ourselves we do calm the beast. Now you are willing and able to accept yourself as female, then the brain kicks in. Yes I finally accept myself as female, so my femininity starts to come through the armour I have worn. You no longer worry about feminine gestures, you put on face cream, you start to look after your skin, and enjoy it

.
But then when you start on HRT to boosts the effect. ENJOY.
Cindy