I was pretty at the same point before i did this, as long as you can be delicate with a soldering iron you are goo to go.
Plug in your info to the calculator, figure out out to supply power to the system, i got a simple male female conector form radio shack the plug the led's into the power supply. i used an old cell phone charger it was 5.5 volts 550mA which required me to find a more rare reistor but i found it had to order 100 but they ate cheap. Also at radio shack they had metal holders that screw together on either side of a plate (i used a plexi glass mounting strip) I got the restors last and could have got a better deal ordering everything at the same place.
So yeah mounted everything up soldered the restors to each led, then soldered a wire to each then to a female connector and tha male on the power side. Plug the power supply into a timer and i have sweet moon lights.
One thing i have come across id people putting them too far back and not lighting up everything well since it's not very bright to beging with. I did a row in the front of my hood that point back at a slight angle and a couple in the middle to back area pointing straight down
Here is a picture of mine, i need to take new pictures with my new camera, the brightness is deciveing since these are long exsposures 6 led's up front 4 in the middle on a 40gal i was able to find fairly bright led's, seems like most of the blues that had the right wavelengh were kinda dim. That is another thing to watch there a couple different blues, i wanted really dark blue don't rememeber the exact number but as low as possible... 460nm-ish i think