That sounds like a perfect place to try it. A couple of things to watch out for before you throw the model turn the prop so that the blade tips are horizontal in relation to the bottom of the fuse that way you will be less likely to break your prop some of those orange gws props are brittle and break if you look funny at them.
On thing make several (3-6) glides before making any changes this will help to average out any inconsistencies with you hand launching technique. Also perform the glide tests after making any adjustments and make adjustment in small incremental steps