find-method

[cfry@MIT.EDU (Christopher Fry)]

CLtL-2 has done an excellent job of making the description of 
find-method obscure.

1. Is the 3rd argument suppose to be a list of class names?

2. Regardless of whether the last arg [errorp] is t or nil, when I call
   find-method in MCL2 it errors. Perhaps I just don't have the
   other args right. Can somebody please provide an example 
   of calling this fn?

3. What I really want to find out is: given an instance and the symbol name of a method,
   Is (meth-name inst) going to error due to the lack of meth-name existing?
   Is find-method the correct fn to be calling?