Hi Mark, welcome to the forum. Not my place to say if you have followed the right conventions but it's a friendly place and not many threads stay on track for long.
October will be a great time to do the work, least amount of animals in the pond. Collect all the sludge from the bottom and some of the water, put it in buckets and add it to the new pond. That way you'll keep all the invertebrates that live in there and any tadpoles that are left over as some overwinter occasionally and finish development the next year.
The frogs will be back in the spring and I'm sure they will be happy with their new home.