Pupillage applications from an undergraduate

Is it worth a third year law undergraduate making pupillage applications?

I am in the final year of my law degree and I am thinking of making some pupillage applications this year. What are Chambers attitude to such applications? Anyone have any experience of doing this? Is there variation between different practice areas? I don’t want to spoil my chances for subsequent applications, but I would like to get on the “pupillage hunt” as soon as possible.