people like DTR have made DIY as easy as two seconds assembly time. you can suck at soldering AND still build. I will do custom builds you nice folks just have to ask. Back on subject it takes maybe 30 minutes and no prior experience. its that easy.
It truly is very, VERY easy. heck, if its the soldering you are scared about, you could hot glue the wires together....don't recommend that in the slightest, but it could be done lol.
DTR sells diode+driver combos, where you get the diode pre-pressed into an aixiz module, attached to a driver set at the appropriate current. all you have to do is solder the two driver leads to your host, in whatever way you need-for pens (you can get very nice pen kits from Jayrob for ~15$ shipped) all you need is to solder one wire to the switch board, and make the other contact the host in some way- i just used some glue for mine.
Will save you a lot of money, and especially for 405nm, will give you a lot more visibility....I have had a few true 5mW 405's, and they are pitiful. Can't hardly see them in the daytime, absolutely no beam, it's just sad. But, go with a custom build, and you could easily get 500-700mW.
PM me if you have any questions about pen builds, I have done a few, and I would be happy to help