please help me find glasses
Are you at the beginning, right after the cut scene?
Spoiler
Have a close look at the lower right compartment in the book case and remember. The glasses are small compared to the other items...
tHANK YOUI NOW HOW DO I TURN INTO THE OTHER CHARACTER
Either automatic or
Spoiler
If you want to switch to the ghost character, interact with the fireplace.
Vice versa to establish communication, but then the ghost sometimes has to interact several times with the fireplace and dragon and also make sure that the main character is aware of the reaction. Blowing into the fireplace while the main character stands in front of the book shelf is useless.