No headlight wash for me. Also manual seats. Forgot to say it's an early 99 4litre

I have low line becm and have dual zone fully automatic climate control (digital display)

Hi all, New member here - so first off "Hello everyone!". So, to business. I'm considering fitting aftermarket parking sensors myself, so a quick question to those of you who've done it. How do you get the wires from the sensors into the boot? Is it easy? Does it involve drilling? As a bit...