The LH in the middle of a word is one of the trickiest pronunciations. Really though, it's not that hard. You just need to remember to half-pronounce the 'L'. So, it's not trabayar it's, trabaLHar. Feel yourself saying the L. But don't dwell on it. As soon as you feel the L, continue right into the rest. You can treat the h pretty much as if it were a Y.
Let's hear it from a native, shall we?