I got my boy cat 5 weeks ago, and him and girl cat are still hissing and fighting 
BC bully's her, will sit in her way and not let her in the room, except the bedroom, where she has stood her ground and won't let him in, I now just shut him out of there at night, but I don't really like shutting my girl in I. Case she needs to use the tray/ eat.
They don't fight all the time but at least 3/4 times a day there will be some hissing and each of them has had a least 1 scratched nose, nothing worse though thankfully.
GC used to sit on my knee but won't now because BC has decided he wants to sit beside me all the time, he's really lovely but I feel so sorry for GC.
Even when it comes to playing, he takes over and she just sits and watches now.
Should I just leave them to get on with it and hope they call a truce eventually or is there anything I should be doing?