You can find DIY mod instructions in many places, check out the modders forum, madvapes has them as well as box and tube kits if you don't want to start from scratch. With a few basic tools, soldering iron, drill and dremel you should be able to complete one.
Whether or not you should do it only you can decide. If you already have the tools then I'd say go for it, you can save some cash. If you don't already have the tools nor and interest in modding and this would be a 1 time thing then it's probably not worth the investment or time, plenty of good choices out there if that's the case.