First, you should learn the punjabi alphabet. This includes the vowels (sihari, bihari, kanna, etc.)
Then pick up a punjabi newspaper and sound out the words. Write them phonetically in English.
Take your phonetic interpretation and put it into an online punjabi dictionary. This will give you the meaning.
Slowly piece together the news article. You will get the hang of it if you keep doing it. It will be harder for non-native punjabi speakers, but still do-able.
Now take your newfound abilities and pick apart gurbani piece by piece.