OK. I followed the directions and the forwarder launches to blackscreen, so I had to restart the system. I was asking a lot of questions because I guessed this might happen due to reading elsewhere on the forum that forwarders can be problematic on Tiramisu. Hence why I didn't just dive in and go for it.
I've done a lot of things so far from just following YT guides, plus other guides here on GBATemp, and just trying stuff out. I only reach out and ask questions if I feel it's absolutely necessary, mostly to understand the processes involved as fully as possible.
Anyway, I've decided to start from scratch with Nintendont. I'm going to read
the OP again and hopefully I'll be able to get set up from there.
I appreciate everyone's help with this so far.