This is my first bow - it's a low-end recurve with a draw weight of 14kg nominal. At the shop they told me not to string it by bracing it against my foot, because the limbs get twisted sideways. They recommended I purchase a stringer.
However, I am a bit skeptical. Firstly, at the training grounds that I visited several times, the instructor was stringing the (I admit, very introductory, maybe 7kg) bows by hand and foot. Secondly, the guy at the shop also didn't use a stringer when he was test-stringing the bow.
So is a stringer necessary? If not, what is the proper technique to string a recurve without twisting the limbs?