I chose to do this second time round and I am still exclusively pumping 8 months in. Absolutely hated breastfeeding "normally"the first time and couldn't face it again, but I still wanted my baby to have the benefits of breastmilk.
I went in a bit blind, didnt stress about it too much its worked out really well and I've loved having more freedom.
I started hand expressing for a day then moved to a pump. I pumped every 3-4 hours from the start and established a really good supply.
Maximum i pumped was 7 times a day, dropped to 5 pumps around 9 weeks then dropped to 4 pumps and got rid of my night pump around 4 months.
You will need a good wall pump for the majority of your pumps (I really recommend the spectra S1) and if you want a bit more freedom get a wearable aswell.
I do the pitcher method and I don't sterilise any bottles or pump parts, just hot soapy water.
Ive also donated 20 litres of breastmilk to another baby.
To be honest its been fine, Ive quite enjoyed it, takes a month or so to get in the swing of it and organise your milk but no different to the amount of time it takes to get in a routine with breastfeeding normally.
Just as a sidenote my hospital wouldnt let me leave without her feeding and obviously milk takes days to come in so I did use formula alongside colostrom for about 3 days before switching to only breastmilk when my milk fully came in.
Good luck :)