Not much to add.. others have said everything I would have. Be patient... doing your own (building) is a learning curve... might take 3-4 tries to get it right, but once you do, it's like just do it the same every time and you are good to go

Whatever you get, watch videos... hard to describe wicking in words but a video makes is very easy to learn. Also, depending on the tank and build, it's important to choose the right juice (VG/PG ratio) too thin they leak, too thick they don't wick enough. 70 % VG is good for most RTAs. I would totally also consider the Vapefly Galaxies MTL RDTA

I would get one but have moved on to restricted DL (if I could afford it, I would have ordered two a long time ago) The Pecisio would be my first choice for a nice MTL RTA (but a bit pricey) Even (like Anna said ) the Siren 2 if you can find one. It really depends on how tight a draw (airflow) you like. I like looser so had to pass on many good MTL RTAs because they have a tight draw.