I bought a pressure pointer long ago, it helped for the places I couldn't reach, but the wooden tip should have been made with a firm rubber - it is too hard and has a slippery finish so slides off the TrP quite easily.

but really it is not necessary to have the tool -any small firm ball or small rubber object will work fine if you don't have a good friend w/ thumb or finger tip close by.

I found tennis balls, a smaller dog ball & even a golf ball will work fine.

You can lean on them against a wall or door, or for more pressure lay on them on the floor and roll around to find the spots that need the focused pressure.

and here is the user guide with tips & how to treat the TrPs from the same site-
http://www.pressurepointer.com/Users1.htm