<human>: Can you provide a brief overview of the text?

Dear all,
I apologise in advance for my bad grammar / formatting, English was never my strong point.
Anyhoo - I'm 18, living in England and I work in IT. I did a Level 3 apprenticeship in IT at 16 and got hired full time as a Technician at a local Academy aged 17. I'm now 18 and recently handed in my notice as I want to try going self-employed in both IT contracting and maintenance / repairs.
As a technician I am on £15,000ish per annum pre tax, and self employed I predict to be at around the £25,000 per annum pre tax. The issue came today, when speaking to my boss. He asked if I would stay for some extra wages, I declined but he continued to ask me if I would consider it if I was on our old Deputy Network Managers wage of around £23-25k pre tax.
The job itself is not great. We are understaffed (Our deputy network manager left fairly recently and senior management are taking their time to replace him) we are overworked and we are pushed to our maximum day in day out. As a junior techy, I was able to push all of the frustration to my boss, but as a deputy on more money I would be required to take some of it on the chin.
Do you guys think it would be worth taking the chance and agreeing to come back and work for the £23k-25k a year rather than going self employed?
<bot>: Worked in IT for 12 months @ 15k, have the chance to keep a stressful job for 25k or go self employed with no guarantee of being successful.