To answer bluntly – no, your toes should not touch the front of the boot. There are precise steps that you should follow to ensure that the ski boot fits properly. Do this:
Put the ski boot on
Slam your heel back, either by pushing or just tapping the heel of the boot against a wall or the floor
Push the tongue of the ski boot down
Tighten all the bootstraps
Stand up in an athletic stance and put pressure on the front of the foot
Make sure your toes are not touching or sliding into the front of the boot
Your heel should also not lift out of the heel pocket of the boot
That’s it! If you follow these steps precisely, it is almost guaranteed that you will get a well-fitting boot. Of course, there are some fine details that only professionals know, but this is a rough idea of how to get the sizing process started properly. By following these steps you will get around 80% of the ski boot size correctly.