Well excavation

I'm looking to dig a well in my suburban garden, but I would like to avoid contractors and companies (expensive and I had bad experiences previously).

I know the stratigraphy in my plot (3m clay, 6/9 m sand, then clay) and I know from looking down a well 30 m from ny house that water is between 3 and 6 meters deep (depends on the rain).

I stumbled across a plethora of documentation on how to dig wells by hand in Africa (https://www.practica.org/), and I also saw on YouTube a guy doing water jetting alone (https://youtube.com/@appledrains?si=7ipZwvRdSRub45IZ).

I am convinced it's feasible, but i'm debating if jetting or sludging would be best. Also, what pump would suffice? I have a pressure washer, but my impression is that a bigger, more powerful pump may be necessary... Any thoughts?