Can you reclass to Infantry in the NG after MEPS but before basic training?

I recently swore in to the national guard at meps in January as a 91b in the NG and am scheduled to head to fort Leonard Wood on June 20th for basic training. I have recently been finding myself more and more wanting to go infantry instead so I was wonder if number one is it possible to reclass to infantry before basic training in any way and two is it worth it?