Evan,
When I got my Initial CFIG several years ago, our local DPE was not allowed to do initial CFIG, and I had to get the exam from one of the local FSDO guys. He came to me, and I provided a place for the oral exam, the towplane and the two place glider.

Based on my experience, expect a very thorough oral exam, where you need to answer the questions the FAA way (exactly like the written tests). The actual check ride won't be a problem for someone at your skill level. In all probability you are going to have much more experience with a glider in flight than the examiner.

I thought it was easier than my commercial oral/check ride with our local DPE.

Always guard the stick, and keep your feet lightly on the pedals. At some point every student will surprise you at a very inopportune moment, and you don't want to delay your access to the controls.

SF