Another shout out to the Flash-e-vapor !!!! I love the older V3 but the v4 is basically the same, but give you more air if needed. The genuine are expensive, but built to last. If you want to get a clone, there are a couple but hard to find clones. Really well made, only thing that gives the clones away are the quality of the knurling, if you are really looking.
2Fvape has them and Gearbest sometimes has the V3 and V4.
I have really, bad shaky, hands. You cant get any simpler than the deck on the FEVs. Both versions are MTL, and have at least 3 different choices of air holes.
The only sort of " tricky" and I mean , its really minor but you only have to do it once is making the little mesh straws that trickle the liquid down on to the wicks. You have to use the right SS mesh which depending on your liquids' PG/VG ratio you need to roll in the right density.
Another really easy and actually easier one , is the Nectar RTA. You just make a simple coil, put the wick in and stuff the legs down the tank.
Both have great taste, but the FEV, is my favorite, no leaks, easy to fill, you dont need special tools, just pour.