Is £2k / month take home a viable wage for a low hour newbie FI ?
No it's not.
You would need to have a gross salary of nearly £33k (under PAYE, slightly less if self-employed which would be more likely).
However, can you work part-time/freelance in IT at the same time? This would normally attract a higher hourly rate and may then be viable.
Cheers
Whirls