about sukhasana,
it could be beneficial if you have support under your buttocks/sitbones , so that your hips are higher than your knees when sitting , this helps release hips and groins enabling the side trunk/spine to lift more easily.
If sitting for an extended time eg meditation, it could be helpful to support the knees.
Keep practicing asana.eventually we may be able to sit in full padmasana for about on hour or six without disturbance to the body or mind , but of course we are not concerned whether we can do this or not.
please note I have posted this in wrong thread if moderator reads this can we delete it sorry folks.I have tried to delete but cant