I only managed to get one sim card in as well and in slot 2. Luckily the sd card came free with mine and was already inserted. I don't know how to get a full sized sim in slot one as the phone moulding appears to have the cutout on the wrong side???
About SIMs: The phone only accepts two small ones. One has to be rotated 90° and is placed blow or above the other one. Took me a while to figure that out too.