We did a half day and full day of hiking with Mohammed. It was arranged for us by Jamal Tamarlane. We met Mohammed at Imlil Lodge and went over each route with Jamal/Mohammed. Both hikes were excellent, or second hike was a full day adventure through 3 Berber villages and through 2-3 mountain passes. Along the way you pass shepherds and their flocks of goats/sheep, get great views of Toubkhal, and get a little view into daily life in the mountains.
Mohammed was a good guide, knowledgeable about the village, historic customs, the impact of global warming on the mountains, local plant species, etc. He spoke adequate English but was fully conversant in French. This didn't bother us as we were looking to practice our French, but if you were an English-only person... it might have bothered you.
A great experience, the full day hike was one of the highlights of my Moroccan vacation.
Cost is extremely reasonable and includes lunch. And you can definitely do these hikes on your own, trials are distinct though unnamed. if you have experience hiking, go for it. We debated it and ultimately decided the local knowledge and convenience was more than worth the cost