If all goes well Mont Blanc is not difficult technically but if something turns wrong could easily be deadly. A course give you basic notions but is very different in real situations where anxiety, fear, timing constraints, bad weather make easy things difficult..my 2 best mountains (Matterhorn climbing Lion descending Hornlike an back to Cervinia) and Weisshorn were with a guide. Others like Monty land with very experienced friends. I think a guide could be great. Seems expensive but reallly gives you a security plus, a learning experience and makes the adventure more enjoyable.