Thanks.It depends on your N64. They come with different video DACs. I think this page lists them all. The MAV-NUS is hardest to solder and that is definitely smaller than MSOP. Hereyou can see an RGB mod installation on the MAV-NUS. I think that is comparable to the installation process of the HDMI mod.
The other ones are pretty simple to solder to, but I am not entirely sure if they are comparable to MSOP.
I hope I don't have a MAV-NUS chip. I might still be able to handle it with the right improvisations.