I am self employed and my advice would be not to do it. The stress and insecurity of income is immense.
Secondly looking back now if I had had a secure job with a regular income again and knew what I know now I would never have become self employed. I'm now suffering from stress and depression because of it again and have to go back to the doctors for the first time in years. I got shingles around last Christmas because I was so run down by working all the hours possible just because the work was there.
I couldn't take any time off to recover because being self employed there's no sick pay or holiday pay or benefits of any kind.
In any job you have to take the rough with the smooth. My advice for what it's worth is do that and stick to your job like a limpet. If your self employment goes tits up you'll lose the home you've worked so hard to buy because self employed get no government aid. We are trapped in private renting forever because being self employed I can't get a mortgage and at 40 I'm too old to go back into another job.
I echo the above, only I'm 51 and virtually unemployable by 'proper' companies due to injuries sustained in my working life. My guitar teacher employs me part-time at the moment as he recognises that I have skills and experience that he won't have for another 20+ years.
Partnerships are tricky beasts, at the best of times. You'll need a watertight contract, an accountant/advisor will help you there and I would suggest doing anything self-employed part time first. Suck it and see, sort of thing. When being self employed works, it can work very well and you can do very well for yourself. However, when you start being responsible for other people's incomes, mortgages etc because they work for you, it can cause a loss of sleep and a lot of worry.
Give this some serious thought and don't jump in to anything. It might be worth doing a bit of self employed work, on the side, to see how it goes first.
Before you go self employed, try to save up enough money to pay all your household bills for at least 6 months, it'll give you a bit of breathing space. A year would be better, if you can.
When my business was doing well, I was very happy. When Hubster fell ill, I had to take on more work to cover all the mortgage and bills plus give him some money to spend and then more work to sort out some credit cards that I didn't know about. Things change in business and you need to make sure that you save back a cushion of money to take you through the lean times. It can be scary, exciting, sometimes worth it but I am not sure that I would do quite the same, if I had my time again.