Q. Can someone who has difficulty standing, lean on a shtender during Hatoras Nedarim?
A. Hatoras Nedorim should be done on the onset by the requester standing free (Shach Y.D. 228: 9) and not leaning on anything that if removed would cause him to fall. (See different opinions in Kovetz Halochos 5: 7).
Poskim agree that if one cannot stand on his own, he is allowed to lean or do Hatoras Nedorim even in bed.
Horav Shlomo Miller’s Shlit’a opinion is similar.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a