The Weber 48mm IDA has approximately 100 parts to each side, so it is a good idea to make note of where you keep them. Since most of the parts are small and easily lost, dedicate a section on your workbench for this project and don't move things until you're done. If you're doing this for the first time, it may be a good idea to take apart and put together one carb at a time, leaving the other as an example.