It's definitely challenging if you don't have any prior experience.

My dream was always to have an office shed in my backyward until I decided to build one earlier this year before the pandemic. It turned out pretty good and it took me around three months to build it. Its hard work for sure but I couldn't be happier.

I wrote a blog post about it. https://eduardosasso.co/blog/how-i-built-a-wfh-shed/