Without making it too obvious (hopefully)... For the final puzzle:
-Pbhag gur qvzrafvbaf bs gur tevq va gur svany chmmyr.
-Pbhag gur qvzrafvbaf bs gur tevqf va bgure tevq chmmyrf.
-"Cvrpr vg Gbtrgure" vzcyvrf fbzrguvat gung vf qvfnffrzoyrq juvpu zhfg or nffrzoyrq.
As for deer's dear:
-Guvax nobhg n qrre'f zngr... be cnegare?
Secret messages:
-Gurer ner zber. Naq gurer vf n jnl gb beqre gurz.
Sorry for the late reply! Hope you've enjoyed it so far and manage to push through.