Good luck Johnathon in sorting out your rear brakes, every mistake is a valuable lesson learnt for anybody and anyone that takes on something new to them will not get it right first time every time.
No one on here that is hands on will be faultless I can guarantee that as it's not the way engineering works in my lifetime of being involved in it.

Well done admitting yours and reaching out publicly, this forum is the place for sharing mechanical encouragement/knowledge and friendship .