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Yes it is very possible. It is very expensive to verify that you did it correctly and that it works as intended.

Genetics are not like code so unless you are copying previous work expect a very long road

It's most definitely possible. Check out the thought emporium YouTube channel. Also the 'unnatural evolution' series on Netflix.

you can do CRISPR/cas-9 in your kitchen, if you really choose (you can google diy kits for it. I endorse none, have no affiliation with any).

verification _can_ be tricky, but you can also send off your sample for sequencing fairly cheaply and quickly these days.

so, go for it!