........and at least get properly measured to use as a starting point.....
I completely agree about getting a proper fitting /measuring, but I would just highlight that because you are (say) a 10M in one brand doesn't mean you are a 10M in another brand.
You do need to try on each boot brand / size as they all manufacture to very different physical sizes (particularly width and toe-box size)
If you happen to have 'wide' feet then you cannot get better than Meindl (but you are looking at probably 2x your budget.
I bought an excellent (comfortable) pair of Boots from Aldi (I can already hear the howls of horror) not leather and not very water RESISTANT, they were perfect for walking the 'lanes & farm tracks' around me, for 8-10-12 miles 'day walks' but I'm not sure I'd have wanted to take them out onto 'the hill'.
They only lasted about 300 miles before the soles were worn out and developed a squeaking-crack, but at a price of £19 they could be considered as disposable.
I then purchased another pair (different style) from Aldi but these were agony after just a couple of miles - they now just sit on the boot-shelf looking miserable.
I replaced them with Meindl Merans at 10x the price and yes - they are probably more comfortable and better made and will last longer than 300 miles but at 10x the price is it justified
You pretty much do get what you pay for, but the important thing is to try them on and then walk around the house with them on for 10-12 hours per day for a few days, if they don't hurt then they'll be OK - If they hurt then take them back. No guarantee how long they'll last, but if you have a limited budget you can only do what you can do.
Once you have taken them outside you cannot return them