So I'm just starting out and I am doing the spider exercise that is shown in the beggining lessons. I'm having a problem though with getting every finger in place. The first and second finger in the first and second fret work mostly fine but when I get to the third finger on the next fret I just can't stretch far enoguh while still keeping the other fingers pressing down. I'm watching the instructor and I see what she is doing but I am having a hard time getting my hands to do the same thing.

I have small hands but I'm a very big man. Am I going to have a very hard time learning guitar with small hands? Is there any way I can practice this and get better?