#3
u bend up and down. if it seems difficult it could possible be ur fingers arent strong, or technique (though i cant imagine HOW to do it wrong). or complete and udder "poopty puebty pants"
#4
try doing a classical vibrato instead of the side vibrato thing, where u bend the strings a tiny bit up and down. im just assuming ur doing the side vibrato since thats what most new guitarists do.