Thanks all for the tips! I am going to set up the spare room with blankets that Celeste likes to sleep on (she likes to sleep on anything really, she sees all my belongings as an empty canvas to shed fur on) so the new cat can smell Celeste. I will try to be patient and give the cats lots of brushing and treats. In a weird way I feel a bit sad that Celeste won't be the only cat, like it's the end of an era. Hopefully she will be happy with her new friend in the end.
Thanks all for the tips! I am going to set up the spare room with blankets that Celeste likes to sleep on (she likes to sleep on anything really, she sees all my belongings as an empty canvas to shed fur on) so the new cat can smell Celeste. I will try to be patient and give the cats lots of brushing and treats. In a weird way I feel a bit sad that Celeste won't be the only cat, like it's the end of an era. Hopefully she will be happy with her new friend in the end.