Step 3 - Buy a plughole hair catcher.
Buy a hair catcher trap for your plughole – it is a measurable way to see how your hair loss declines (and it will keep your bath / shower draining faster).
I favour the white plastic type (which usually cost less than £3 ), as they don't go rusty, so they last ages and the hair is easier to remove when snagged in the holes than the fine metal mesh versions. Be sure to measure the diameter of the plughole, as they come in different sizes. It will last years if you keep it clean with a weekly scrub.
To monitor your hair loss, clean the hair trap out after each hair wash - at first you'll be horrified how much of your hair falls out with each wash, but as you reduce the frequency of washing and your hair strengthens, you will notice far less shed-hair in evidence.
If you don't have a traditional plug hole, you need to unscrew the pop-up waste (wearing rubber gloves - brace yourself if you've not cleared it out before..). Remove the existing hair strands with tweezers. Then check the pop-up waste every week, and see the amount of hair reduce over time.
Both types of plughole (traditional and pop-up) will benefit from regular cleaning. If your plughole is already blocked / smelly then as a one-off use a branded plughole unblocker (with care) before starting to regularly use these more eco-friendly methods...
Tip (approximately) 2 tbsp of bicarbonate of soda followed by (approximately) 2 tbsp of white vinegar (available from refill shops once you have used up the original bottle) into the plughole, leave to fizz for 5 minutes then rinse slowly and thoroughly with boiling water from a 1/2 full kettle. You MUST aim carefully when pouring the boiling hot water, aim exactly down the plughole as you don't want to crack the sink / bath! Every week, when you clean your bathroom, trickle a half-full kettle of boiling water slowly down each plughole, to keep it smelling fresh and (with the help of the plughole catcher) un-clogged.
If bi-carb and vinegar and boiling water is too much faff, then try the once-a-month 'Enzymatic Drain Cleaning Sticks' made by Ecozone, sold by Ethical Superstore and Amazon.
Who knew that plughole analysis could be such fun!?