Should rename the thread, I thought someone was complaining about the Uni itself.
I installed mine on a 3-5 AES and broke 4 traces in the process (prying out the old BIOS that I thought was completely unsoldered via screwdriver .... turns out I was wrong) it took me a while to "fix" it and I had a socket installed already (coulnd't really see the damage before that).
Unfortunately because of the path some traces had to take I had to use the soldering iron to melt the plastic outside the socket pins to reach the metal pin there and then solder on the side (I didn't want to have very long wires go all the way to the bottom of the board and didn't find any suitable place nearby to drill a through hole). One of the socket pins now "sticks" a little more than I wanted to (no doubt because of my soldering job on it's outside part) but I am able to fully extract the BIOS eprom and replace it as new versions are made available .... so I am a happy camper in the end.
For sure take your time, slow and steady.
I learnt the hard way in this and other "soldering adventure" that there's no such a thing as a 5 minutes soldering job with me, some shit always happens so I make sure I have plenty of time to calm down and fix my mess.
EDIT: agree with the NESRGB install, in my case though the issue was that I soldered the pieces out of order wrt the adapter for the Twin Fami .... upon desoldering I broke 2 traces in the adapter itself .... couple of wires and I was back in business .... but before that I attempted to desolder the adapter from the NESRGB itself which overheated and dropped 2 of the SMD capacitors on the RGB pins and one on the regulator path [I was using a hot gun] .... Tim at a point offered a replacement if I couldn't fix it .... but I did and felt good that I gave myself plenty of time.