Thanks for all the links and pictures they really helped.

My Backup N900 uUSB started to play up, intermittently charging and bringing up mass storage mode on disconnecting charger.
All went straight forward and the heat from reinforcing the connector has fixed the problem.

I actually found it took me longer to re-assemble the device than repairing the connector.

A few helpful things from my experience:-

Disassembling the screen makes a horrible sound as mentioned many times, don't worry about it (it was a bit worrying even though I expected it).

I find a thin guitar pick useful for separating plastic parts, like the keyboard bezel.

A scalpel is useful for scraping the green from the PCB.

Keep your soldering as tidy as possible, keeping in mind the PCB as to fit back in that small gap.
If your solder "blobs" are too big they will foul the casing on re-assembly.
I carefully removed excess solder with a scalpel and trimmed a tiny piece of the plastic casing to make sure the PCB sat back flush again.

When re-assembling make sure you re-connect the ribbon cable to the screen then hook the slider tray in (took me a couple of goes to work out why the slider wasn't flush).