I don't know if this will work on your new chairs but in mine it's push back with your none fistula arm. Shove your butt back as far as it will go and your up. It's not easy but at 150 kilos when I started dialysis I was embarrassed by the team of tiny nurses pushing to get me up. It took 6 months and 3 infiltrations to learn. Good luck I hated feeling stuck in the chair.