Personally I would be inclined to get someone to do them for you. Also changing the lower is a right faff!
If you wanted to do them yourself, look at the pics in my project thread.
Service from Craig @ AP Developments has been very good, and he has an excellent reputation.
If you don't want to take your car off the road, I could loan you my inlets for a £200 deposit - fully refundable upon receipt of your inlets.
Also, based upon my experience from yesterday, try and get hold of a spare MAP sensor - mine broke when I was trying to remove it from the original upper inlet, which means my car is sat at the garage until a new one comes on Tuesday.
Finally, I would also suggest you get replacement gaskets to go between the head and lower inlet, and between the upper and lower inlets.
Anything else I can tell you, give me a shout.