I only occasionally record more tracks than one. But the procedure is almost the same.
I use a medium powered laptop that I bought last year. I believe it has 16 GB of RAM, which was a priority since I bought it for this purpose. I think that pro's will recommend 32 GB for video editing, but I figured that since I only do small 720p videos I should be able to get by. My desktop PC only has 8 GB, and I did manage to record stuff on that. That was in Windows Movie Maker, which doesn't take too much power.
I used to record audio with a USB mic on my desktop with Audacity (freeware), and a camera on the side. Then combine audio and video in Windows Movie Maker.
Before combining I would adjust the volume in Audacity so the level was decent compared to other Youtube stuff.
I would sometimes record audio with USB mic on a tablet for mobility. Then I would often need to turn the volume all the way up before exporting, then import to PC and Audacity to turn up the volume further before hitting acceptable levels - my tablet did not give the mic enough gain!
Since I got my laptop, I have been using the "Reaper" DAW with a USB mic. Reaper is $50 one time payment, so kind of cheap for a DAW. The new PC's don't come with old school movie maker, but I was happy to discover that Reaper allows you to add video tracks to the mix. Then when I choose to export to mp4 in stead of wav files, I get a video. So I record on a camera and import it into Reaper.
The video features are not many, but it generates a rather "steady" video compared to the free video editors I have tried. The weird focus issues in my videos are due to my camera, not the video editor.
When I do more than one track, I often give up on doing video. The videos look less cool to me when I have headphones on. It takes a lot of efford to get the timing right, which means many takes where I would need to turn camera on and off, or I might need to stitch the audio together from more takes. Sometimes I record myself with ukulele without headphones, then add more tracks without video. But I feel that when multitracking, I really SHOULD listen to a click track, record the bass first, and all those things that "real" studio people do.
I usually end up being happier about the songs I have done without multitracking than those with, since you cant hear how much my timing is off. Here are two examples where I went all in on the video editing part to get video of several instruments, but at the cost of some timing issues.