I think a good progression for people that cannot do it properly right away is to have something steady in front of you that you can hold with both (or one) arm

I think a good progression for people that cannot do it properly right away is to have something steady in front of you that you can hold with both (or one) arms and allows you to keep the position for longer periods, until your joints, muscles and tendons start adapting. This is the way I’ve seen different people with different limitations continually make progress until they can do it properly.