H..4.1 Do I need to know IDL to run GBTIDL?

No, but it helps. The GBTIDL syntax is similar to UniPOPs and it is possible to reduce many types of observations without much previous IDL knowledge. The GBTIDL User's Guide shows you how. However, if you'd like to go beyond the standard reduction facilities provided, some IDL knowledge is required. If you are not familiar with IDL and would like to learn, you may find the IDL primer useful. Links to a few primers can be found in section 1.6.