Easier for him to resist. He wanted her to be alive, but his eyes would be red, right? Unless he went hunting after... which I think he did... sorry thinking out loud.

2. Edward admits that Alice has seen Bella as a vampire. Why do you suppose, since he of all people knows it's crazy to deny Alice's visions, that he is so resistant to giving in and changing Bella?
He doesn't want this for her. I think he makes that pretty clear... or I used in a lot of my explanations.

3. Bella begs Edward to never leave her. Although he never exactly promises NOT to leave her, he does say it would be impossible for him to even try. Knowing what we know about New Moon, do you think he was saying this as a way to tide Bella over and keep her calm for now? DO you think he had plans even at this point in the story to one day leave her?
I think that he knows that leaving might be a necessity after a while, but right then and there, it would be impossible to leave her. He wants Bella to be safe, no matter what the cost, as we see in New Moon.
4. Bella and Edward argue about her becoming a vampire, to which he point blank says that he will never do that to her. When I first finished reading Twilight, I was very torn over whether or not Bella should become a vampire. How did you feel at this point? Try to ignore all the discussions you've had here at the lex and focus on your first initial reaction. Did you think Bella should be changed right away and leave her family and life behind, or did you think Edward was being sensable to tell her that her mortality was important and more natural than anything he could give her?
I had mixed feelings. I saw where Edward was coming from, but seeing as I see myself as Bella, I wanted to be with him forever, so I wanted to be a vampire. But some aspects of Edward's argument made me be like, yeah I would wait until after I'm out of the house, but I would want to be with him always.
I'm not sure if that makes sense, but that's kind of my brief explanation.