I can relay my experience of supporting a friend through a late term abortion, she was 23 weeks. For a bit of background, she had 5 children and the youngest was around 12mths old. Her partner was on the scene but was not supportive of the pregnancy, didn't think they'd manage another baby and financially things were very tight. She was not as set on ending the pregnancy and I think that's why she'd left it as long as she did, in the hope he'd come around.
She had the procedure over 2 days and she said that went as she expected and how it had been described to her. The staff were lovely and supportive throughout.
Afterwards she did struggle immensely with hormones, grief and guilt. That's not to say she made the wrong decision or would change it if she got the chance but she was unwell for a good while. She started having regular panic attacks and was given antidepressants and propanalol for anxiety by her GP. I would say it's taken a good 2 years for her to get back to better health. She now seems a lot more at peace with the past and the decision she made, but doesn't really talk about that period and I respect her wishes on that.
But her circumstances aren't your circumstances and our coping mechanisms are all different. She didn't access any sort of counselling or therapy afterwards, and tried to suppress a lot of what she was feeling. She hid the pregnancy from all her family so didn't have any of them to talk to or seek support from. It sounds as though you have a lovely support network around you family and friend wise, that helps a great deal.
Genuinely wish you all the best with whatever you decide to do, either way you will be ok x