it cant be; its self-refuting.
i think the other answers given are generally right with one critical exception: empiricism is not merely the use of empirical methods to gain knowledge. empiricism is the EXCLUSIVE use of empirical methods for knowledge. at least, the kind of empiricism most people mean when they use the word.
in other words, empiricism doesnt say that no one else can use empirical methods. other epistemological approaches can use these means. but empiricism does say that one must use only empirically-derived information; hence "empiricism."
put another way, empiricism says you can only have knowledge of things you have empirical (physically observable) evidence for. interestingly, there is no empirical evidence that empiricism is true. simply stated: there is no physical proof that physical proof is the only kind of reliable proof.
this is not just a word game. think about it: why assume that the nature of reality requires that we can know it ONLY through empirical means? why assume empiricism? after all, we can not empirically see that empiricism is true. it is self-refuting.
empiricists are empiricists because of their intuitions that say this is how the world is. unfortunately, empiricism says intuition is invalid as a source of knowledge. hence empiricism has no way of supporting itself.
there are empiricists who allow for intuition in their methodology. but strictly speaking, they are not really empiricists.
so in answer to your question: empiricism cannot be used in life (logically anyway). however, empirical investigation can and should be used. just realize that you dont need to limit yourself to the empirical methods only.
to use empirical methods, then, simply means to come to hold beliefs based on physical evidence. you do it all the time, without thinking about it.
but my point is, you use other sources of knowledge besides the empirical.
for example, mathematics is a field full of non-empirical knowledge. if we required observable evidence for mathematical computations, formulas would, at best, be limited to those things we could re-create using physical objects to count with. while we can sometimes use the physical world to check our mathematical proofs, we dont know these concepts through the physical world. we know them through mathematical intuitions (by intuition i mean intellectual seeming, not gut feeling). such knowledge, then, is non-empirical.