I will start in the traditional way by saying that I have been reading your posts for weeks and have learned lots from these forums, the wiki and the book. I've adopted the name saving-10-years - which I now realise is a little ambiguous. I am very near to taking retirement from paid work and have been putting a little extra aside into my pension for 20 years. Thanks in part to this I will have a pension equivalent (after tax) to 49% of what I currently take home (after tax and various pension deductions). I will also be able to buy a property from savings to rent out. I am therefore, at 57, in a position to take retirement nearly 10 years before I will draw my state pension. (Yes I am another Brit with a pension that seems to be getting further away from me each year rather than nearer).
Before I discovered ERE and the book I had already done the maths that said that at 57 I could live reasonably comfortably by being careful with money, buying property to let and doing some small craft-based business or very part-time work. When I say 'I' I mean 'we' as my husband was made redundant nearly three years ago and has been acting EREish (very happily) since. The final part of the family is school-age son (16).
I currently am an academic and am sure (because they say so) that colleagues think that quitting right now is a strange thing to do. I have invested a lot of time in building my reputation and have completed a handful of degrees, incuding a PhD - long drawn out and only finished in the past couple of years after a lot of grief. But having a partner who is frugal and who has proved that we only needed 60% of our former income has led me to realise that we could live on (say) 30% of former income (which just happens to equal my pension). Adding some extra sources means that we can live somewhat comfortably and more creatively (which takes time). So we are becoming extreme by stages. Doing so at this time in our lives means that we have property paid for and no debts, plus substantial money in the bank. Yes, investments are something we have not yet successfully grappled with.

Other relevant introductory facts are that I know how to shear a sheep (it would probably be quite a messy job), can process the wool, spin it, weave/braid/knit into things that people would pay money for (I hope) or that we/they can wear (this already happens). We have a smallholding of 4 acres and some sheep so this is a relevant skill. Husband can make most things with wood. For example he has since his 'retirement' built us a teardrop trailer (micro-caravan) in wood/aluminium. He's learning how to create handmade books and plans to do craft bindings.
I am INTP (was on previous test INTJ) and son and husband are both INTP (what a household!) I wholly agree with Jacob's comments on specialisation and the time taken to keep up with the field.
As I see it I have 'saved' myself ten years of working for someone else and created this extra decade to try my hand at being a craft/maker and pursuing general and family interests. I will be starting a journal. At this rate of procrastination it may however be the journal of a retiree.