@SweetPepper - it is a hard place to be. It sounds as though you are prepared, which is good. When I took my Mum, I found it best to be practical and try to put emotion to one side, very hard. If there is a point where she is occupied with a member of the CH staff, you may want to slip away, rather than saying goodbye. It is a big change, though a necessary one, and it is no wonder you feel strange about it.
I didn't visit for a few days, to help Mummy settle. When I did go, she was happily gardening, with other residents. Mummy had a couple of good years in her home, where they loved her and she was very well looked after. Far better than we could have done.