no...it is not easier for me to imagine an infinite universe. it is easier for me to think of a universe that contains everything and outside of which is nothing.
as if the infinite universe idea doesn't create a paradox. and infinite universe contains and infinite spacetime in which there would be no begining. observational evidence supports the idea that our universe is expanding, and infinite universe would not do this because it is infinite.
we can follow the expansion backwards and of course we arive at a point, the begining.