This is an easy one to counter. If someone ever tell you they cannot do this because they are not a salesman, say something like, "That's good because this is not a sales business".
It's true. MLM is a mentoring and coaching business or more simply a people business.
Never forget that. If anyone starts to tell you things like, "It's a numbers game" or "you have to get 100 noes to get a yes", it may be time to think about seeking help elsewhere.