I had about half a pack left when I got my first e-cig. It took a few days of doing both to get me started. Once I ran out of smokes, I had no choice to make the e-cig thing work. After that it was easy for me.
But everyone is different, and if you smoke at first it's okay. Eventually you will find what works for you. You don't fail unless you quit trying.
Here's one for you...I still have 4oz of pipe tobacco (or assuming my old habit an 8 day supply) stashed away. What killed me on the tobacco department is the night of my first day, I had an intense craving and gave into it. It was late at night, I was tired of having to consciously choose the PV. It was the foulest thing I have ever tasted. It was like ghost pepper (the kind of peppers they make mace out of) had been dipped into public ashtray and then shoved into my mouth. I finished it but I did not enjoy it in the slightest.