@Magz from Oz I agree, the task is very intimidating and just plain discouraging. I don't have the money either..I honestly can't imagine paying over $1k every three years in order to keep my pictures up.
I've begun the process of converting everything and just successfully fixed the first chapter of my story that was affected by Photobucket's new policy. Like everyone else, it took me around 40–45 minutes to complete (however most of it was the learning curve/experimenting & Photobucket lagging). I used Imgur instead of attachments because the forum finds my screenshots saved onto my desktop "Invalid Attachments" (I think it's more of an issue with my computer). Luckily, it was still very easy to convert everything through Imgur, but it is a tedious process.
Here's my personal method I did in case anyone's curious:
1) Go to Photobucket's website
2) Find the photos you need, and download them (there's a download button above each photo when you click on it).
3) Like everyone else did, rename the screenshots to match the order they appear in the chapter (Riverview1, Riverview2, etc.).
4) Create a Folder for Screenshots on your desktop and place your screenshots in it.
5) Go to Imgur.com
6) From here I simply followed MrsFlynn's instructions in regards to using Imgur –
Click here7) After the images have been uploaded, I click the modify button on the post containing the chapter I want to fix and replace all of the Photobucket links with the BBC Code Imgur links.