You can half ass it with a hammer and a screwdriver, but cheap non-hydraulic crimpers can be had. This is the one I went with. Haven’t had any issues yet. Also, post #4 of this thread details some of the components I used for my installation. Different vehicle, same concept.

Can I use this type of crimper on my 8AWG for #10 crimp lugs https://www.amazon.com/gp/product/B017S9EINA/ref=ox_sc_act_title_2?smid=A3E5YDYCEXB5C3&psc=1