Well, you're seeking out a MTL setup for your RTA, so it sounds like you somewhat know what you are doing. Have you used an RTA before? If you haven't, there is going to be a learning curve, but it's not really insurmountable. If you decide to get something like a coilmaster kit, which contains an ohms reader and various tools for setting up your coils, that may be a bit of an expense, but some folks find it worth it. Others minimalists use steam engine to calculate resistance on their own, then test fire on their mod (there are some disadvantages to this, a mod can be a bit of an unstable base for vaping. I like my ohms reader simply for that reason-- I'm clumsy, less likely to tip over my mod, etc.
The main things you will need is wire, and whatever wicking material you use (many people start out with kanthal and cotton) kanthal's an easy to wrap wire, but you can't use that in temp mode, if you were planning on doing so. There IS a learning curve, I'd suggest going into this forum:
Rebuildable Atomizer Systems
and checking out the coilbulding section and the RTA section to get a sense of what's out there, what might be easiest for you to start, and how to get started building coils. If you buy the tank you are looking at, a few YouTube demo/reviews might be in order, to make sure you are setting up your set up correctly.
It is certainly true that drop in MTL tanks can be easier at first, less leaky, etc., and can be very inexpensive, less expensive than sub0hm tanks and coils, it certainly isn't a terrible idea to start there first. I enjoy the N2 as a device and recently got a Nicholas Firefly tank, where it's a bit of a crossover tank and a vapor producer, but is more of a MTL experience, and it has great flavor.... I literally got this tank yesterday and I've tried a lot of MTL setups and this one more closely approximates RTAs for flavor with no leaking at all. Coils are fairly inexpensive... The Nautilus 2, Nautilus mini or even Nautilus X are all good MTL tanks as well, and there are many others to choose from.
With that said, if you really want to have a RTA up and going, I think almost anyone can, with the right amount of information, tools and patience. I don't take my RTAs out of the house, though, as I don't trust them not to leak unexpectedly (at least not yet) so I'm happy to have some MTL drop-in coil atomizers at my disposal....
Good luck, welcome to the forum!
Anna