DW and I have our hand signals worked out really well now but when I am by myself it can be a challenge. I recently bought a couple of small red safety cones to mark where I want the TT to line up and where to stop and they do help. Still have to get out a few times just to make sure all is okay.
As mentioned, back up with the TT & TV angled on the driver's side if you can.
When leaving a really tight site, you want to take exactly the same lines out otherwise you could end up stuck between trees. I could explain how I know this but I'd rather not. :(