HelloCustomerand welcome to justanswer.com,
If you think you can remove the inner door panel and then disassemble the door handle form the inside. I can send you a link on how to replace it if you wish.
here is the link for replacing the door handle. Looks like basic tools needed only. Just take your time and follow the directions carefully.
Yes , that looks like all you will need
looks like you accepted twice by mistake. Don't see the extra $5 dollars you are talking about though.
I will inform the website to refund you one of the $15 charges.
good luck with your repair and if you have anymore questions you can repost them here without any more charges.