My story: I started rebuilding Vivi Nova heads. I studied a youtube video by PBusardo and cued it up to follow before my first attempt to build. I did purchase, wick, wire, and a multimeter. Then a friend piffed me the Vision Eternity. Soon afterward I purchased an AGA T2 and recently an IGO L. Each time I found the PBusardo review/tutorial video on youtube, watched it several times, and cued it up as a guide when I rebuilt. Never in a million years did I think I would own a multimeter or rebuild anything. I love it. My advice: start with the rebuilding of your Vivi Nova heads to see if this something you would like to pursue further. The biggest cost, if you don't own a PV with built in electronics protections, is a multimeter. I paid about $11 for mine plus shipping; add in a little wire and wick and my start up cost was around $20. Good luck!
This is almost exactly the same path to rba's that my journey took. The only advice that I can really give is to practice, practice, and practice some more.