If you're on 4.0.1, then you don't necessarily need a jig. That's up to you. There are two ways for you to hack your Switch, since your Switch is unpatched:
- RCM (requires a jig the first time)
- Warmboot browser exploit (not recommended unless you dislike the RCM exploit)
You can find more information on choosing an exploit
here.
PegaScape is for people who want to (or have to) use the warmboot browser exploit.
Since your Switch is on 4.0.1 and it's unpatched, you get to choose which exploit you want to use.
You will need to use your computer to partition your SD card for emuNAND, and you will need Hekate. Once it is setup, it's easy to use. If you aren't using online play, and if you aren't using the warmboot browser exploit, then there isn't really any need to use an emuNAND.