Hello Alex,
My soldering skills are not the best and I shied away fro connecting up LED's and working out Resistor values. I was pointed towards Mr RC World,
www.mr-rcworld.co.uk , who do a latching Navigation Lighting Kit for about ?15. This is a small unit about 35 x 15 x 3 mm. One end plugs directly into your receiver and the other end takes 6 LED's which come with a plug and 50cm of lead. Simply plug it in and switch it on from your transmitter. Lots of other good stuff for tecnophobes on the site as well, and very helpful staff. Worth a look.
John