Can I chant 1. Mantra matruka stava and 2. Mantra matruka pushpamala stava without initiation as these contain panchadashi mantra (which is to be practiced only after initiation under the guidance of a guru as far as I know) and are named mantra stavas.
The second one is said to be written by Shri Adi Shankaracharya, I don't know about the first one. If some body has any clue as to who is the author of the first stava please let me know.
And also please let me know if there are any procedures to be followed if one decides to chant these stavas.