hi Gareth
Welcome to the forum...I also have plans to build an 0 gauge layout in the future and being 53 I consider I have a little time left yet...I have built a loco, brake van and a point all without any difficulty and have a nice Martin Finney A1 awaiting my attention in the erecting shop. I think you'll find building your own track work will be a very enjoyable exercise, in fact I got more satisfaction from building the turnout than building the rolling stock, I think you'll find C&L's turnout kits in a bag very straight forward.
Alas i suspect it will be some time yet before I am able to start my layout, too many other projects/interests that need my attention but I will get there at some point, have fun in your hobby and keep the forum updated with your progress.
regards
Pete