It's always a lot at the beginning. But you'll learn a lot from it in the end.
Definitely watch the videos in the link above, if you pay attention it's a wealth of knowledge.
Also, read the bitbuilt forums.
9 times out of 10 the questions you are asking have been asked before, and you can usually find the answer after a bit of digging.
For example, I haven't had to ask a question in maybe 2-3 years on this forum cause I always find the answer after a bit of digging.
In my opinion, the Ashida Portable is a perfect beginner's project and is a very well-done system.
Now, I'm no expert and there are people much more knowledgeable on this forum. So, maybe they will disagree with my opinion. But in my opinion, I suggest installing RVLoader on your Wii to get that out of the way.
Then order the PCB set:
4Layer Tech have teamed up with Wesk to make his legendary Ashida Wii Portable project accessible for anyone to build. This PCB set contains 6 custom PCBs designed to streamline the process of building your very own Ashida. These unpopulated boards include solder pads for other necessary...
4layertech.com
The installation instructions can be found next to the product description in the DIAGRAMS tab.
Along with all of the parts listed on their website that you will need.
Then get to learning. So once everything comes in you'll have the confidence to get it all done.
Don't be scared to take the Dremel outside and safely cut a few things so you learn how it handles. Also, take apart some electronic devices you don't care about and practice soldering. Before you know it you'll be a soldering pro.
Feel free to message me if you have questions you may be too embarrassed to post. I know some people on here can be a bit high strung.But we're all hear because of our love for portable systems and eletronics.