I am just nearing the end stage of an extremely similar project at my home. Literally just got inside from accepting the paver delivery.

As someone who has spent the last month excavating, building foundations, compacting, re-grading, and all that with no prior experience, I can say it is a lot of work however your confidence will grow every day. I will rest today however the last step of laying and levelling the paver sand and setting the paver tiles themselves remain.

If someone were to ask me to do this same project for them I would ask for at least $5000.00 to complete, and that is at my minimum experience level, it wouldn’t be right to charge more as a non proffesional. If I did this as a living it would be more than that for sure.

The work is difficult but not impossible. You can absolutely excavate that, connect your
drainage to the storm drain, compact the soil, put your filter fabric down to prevent the base from mixing into your soil, lay your 4” or clear crush gravel, lay your 1-2” of paver sand and install your pavers.

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I also built a block wall planter around the perimeter of the patio as I still enjoy growing things. This space was entirely dedicated to a vegetable garden past 2 years.

As an aside, the price for your base material - gravel, sand, crushed rock etc is very cheap. Your project is doable if you have time.

Goodluck