backing in a site

Most important to me; don't have anyone out there pointing or directing left, right, or whatever... There's some decent advice given here, but again for me, trying to back and watch the wife or anyone else does nothing... I pull well ahead, get out and do a walk around of the site making mental notes of overhead obstructions, power poles, water spigots, table, etc. I then imagine about where I want the trailer wheels to stop, keeping in mind where those obstructions are, and distance from them allowing enough space for slides; and then back slowly with that spot as my target. I'm the one with the wheel, and any "helpers" distract.