[HatchSurfer3]

Well I need to put a new door on my room in my parents house and Ive been told that the door frames are not a standard size so im going to need to buy a bigger door and cut it down to size. Then chisel out the hinges and everything. My question is, the doors are hollow, so how am i suppose to trim down a hollow door? Do i just cut out a section and reattach the top/side? If anyone can help me out with this i would greatly appreciate it.