no attorney is needed
seller(gun owner) and buyer both go to a gun shop, a FFL , a federaly licensed firearms dealer,
buyer pays $25 for NICS ( National Instant Criminal Background Check System )
if buyer is cleared , finish up paperwork and the firearm is transfered
the end
this is legal anywhere in america
nics is always $25, any other fees (for dealers time) aren't for nics (don't overpay, call ahead)
there may be other legal ways to conduct firearms transfers... this is the most basic legal way
https://en.wikipedia.org/wiki/Gun_laws_in_Nevadagives a good summary and cites as a source NRA website
http://www.nraila.org/gun-laws/state-laws/nevada.aspx