well, I think your being silly to be honest.
1.) your not an enthusiast so your not going to be doing this on a regular basis - so you've got no real need to learn - take it to the shop
2.) you've spent £700 on kit - you can't expect anyone to come around and mess with that without either agreeing with you that if they break it you won't hold them responsible or they have insurance - take it to the shop.
3.) you've just said you have no idea what your doing - yet your telling people that you'll pay £40 per hour, and it will only take one hour, how do you know it will only take one hour if you don't know what your doing ? if you want to learn while this is going on I suspect it will take quite a few hours - take it to the shop and agree a flat price to do the build.
4.) all the time your using on this forum to find people you don't know their abilities or skill sets yet you seem to trust over a guy whos got a computer shop because you don't trust him, find another computer shop and take it to them then rather than waiting for random joe to repond on a forum (see above reasons),