This has got to be a wind-up, right?
I can't honestly believe that you would post on an internet forum for advice on how to do your job.
I can't offer advice to you on the technique used, but what I would recommend is to seek advice from someone who I know and trust. Preferably the guy, or gal, that signed you off for this type of work.
Why not sit next to the previous pilot to watch and learn?
Sorry if this seems a little harsh, but, by your own admission, you were, simply, not experienced enough for this sortie.