Did i screw up bad?

[c20pickup]

So i had my cab painted, very nice job done on it, and i went and mought a painless wiring harness... As you may know it requires trimming of the firewall to install, which i did to the painless template... The harness isnt fully installed and now im looking at the ece wiring harness with all the factory connectors and such.. And it uses the factory hole.. I may buy the ece harness and eat the 400$ i spent on the painless, question is how bad did i f*** up by cutting my firewall? Will the original connector even fit in that hole anymore without slop? Or should i take my lumps and continue to install the painless kit... Kinda frustrated with myself because im an electrical idiot and onbviously didnt do enough research before buying a kit, i do like the idea of the preterminates and pre crimped wires with all the connectors in place, help! What do i do next