As I've said before in threads like this...make sure you get your tax straight from the word go. Register with HMRC as self employed, pay your class 2 NIC's (preferably by Direct Debit, then you won't forget) and put all tax money away into a "high" (relatively speaking, when interest rates were higher I used to get some nice spending money from the interest my tax money generated) interest savings account and do not touch it.