I've had two sections, one emergency and one planned (although I was actually in labour). My ELCS was, without doubt, the most rewarding, beautiful experience of my life. It's my "go to" memory if I want to cheer myself up.
Firstly, plan - do some cooking and freeze it. Get a waist height changing station downstairs as well as upstairs so you can easily change the baby without bending over or getting on the floor.
Get some arnica tablets, they help with the healing.
Peppermint capsules too - it's really common to have trapped wind after a section, this can be felt as pain in your shoulder. Totally normal, easily remedied with peppermint.
Get some Senekot too. You'll get constipated. Sorry if TMI!
Just rest after but I could go for little walks from when I got home and moving does help healing.
If you want to breastfeed it might be uncomfortable to get a good position, don't leave hospital without being confident to position your baby.
Ask for your scar to be stapled, it will leave a much cleaner scar and heals quicker.
Keep your scar clean and let dry completely before dressing after washing and air as much as you can.
The worst part of a section, is the epidural. Stay calm, your DH will be with you. I would be surprised if your Mum was allowed in but she can of course be in the hospital waiting.
Don't be scared of the section, or disappointed to not give birth naturally, it's just the way things go sometimes. Embrace it, the moment you meet your baby will be brilliant. You'll be completely pain free and totally in the moment. The rummaging around, as a pp said, just feels like your baby moving.