Make sure you tune in with Ong Namo Guru Dev Namo before chanting this mantra. You can find plenty of samples on youtube, or you can use this one. https://youtu.be/7b3uFK01-u4
This guru guru wahe guru mantra has been a real lifesaver for me. The breathing pattern created by singing the mantra causes a positive shift in mood and energy level. The other, more subtle benefits, well, you’ll have to find out for yourself.