I do find the notion that an untrained almost 40-yo would make a better teacher than a BEd with four years' training and many, many hours classroom experience a bit 
If my experience of helping ds with his homework is anything to go by, I simply do not have the patience to HEd, which is fine as ds enjoys school. I would certainly consider it though if ds had serious problems at school (and I could afford it) or if the schools he attended were dreadful (they're not).
But I am under no illusion that I could do a better job of teaching him Maths, say, than an entusiastic (or even a mediocre) professional - even now, in Y5 (I am a graduate, a fairly competent computer programmer and have experience working in schools so in theory I should be well equipped!).
I know two families who HE now or have done in the past. One withdrew their DCs from school for absolutely dreadful (imo) reasons that ultimately came down to them not being able to get their act together in the mornings, finding HW a bit of a bind and wanting to go on holiday when it was cheaper. Seriously. They thought school was too much like hard work - for the parents. They lasted a year, iirc 
The other family weren't happy with the schools in their area, and I think also have a bit of an anti-establishment bent. They appear to be doing a great job. They aren't madly keen on other HE-ers locally though, so don't tend to take part in many HE group activities.
Obviously the HE families near you might be absolutely fab, but I do think that if working alongside other families might be important to you, that it would be worth meeting with a few if at all possible. Having said that, I imagine the Internet opens up a whole new world of other HE parents to collaborate with.