Bill,
Here is a youtube video showing how to assemble a 48 IDA and it names the parts that we are talking about. At about 5:40 it sows the installation of the main jets and idle jets and their holders. You would be basically doing the same in reverse. It is quite easy, I have changed out all 8 while tuning in about 10 minutes. A flat blade screw driver is all you need. And for now, all you need is to remove one main jet and it's holder and one idle jet and it's holder.
Wish I were able to be there to help.
https://youtu.be/jp_3OjwmmK8
Good luck Bill, based on your skill set this should be no problem.
Jim