IMO if you can have a go and get it right then fair play! Nothing more satisfying than doing a job yourself and saving lots of £'s

Just take your time and make sure everything is as clean as possible before you put it back together. Also make sure everything that needs to be torqued up is - you don't want anything flying off!! Crash bang wallop

Oh and make sure you get a fresh set of headbolts with your headset and put your stem seals in while you're at it (I hate that bit)