Firstly hello to everyone,
Brue & Ingham, having completed my HNC 4 years ago and having finished my BSC Hons Quantity Surveying last year, I can tell you that you have nothing to worry about. The HNC was very rewarding to complete as it gives you knowledge of every constructional aspect - you'll come away knowing a lot about a little of each profession. (nothing too deep)
In my group we had a good diverse range of students, the majority were contracts manager (well wannabe's and design managers) very few architects and only 1 local authority building surveyor.
If you would like to see a few assignments to get a insight into the quaility expected then please do not hesitate to PM me with your email address. I came away with 9 distinctions, 3 merits and 2 passes.
The HNC is a very good stepping stone into a professional career whther that be as a site agent, surveyor or even architect (horrible word). I was however told that the HNC was being scrapped in lieu of a new age "Foundation Degree", the same level but sounds more impressive.
Anyway hope you both succeed and try to enjoy the opportunity as you'll learn a lot more. If I had to give any sort of advice I would recommend that you manage your time effectively as your expected to complete a lot of assignments in a relatively short time.
I hope I have been of some assistance, it's a walk in the park "really".
Best Regards
Scott