I'm no maths genius myself either and QM is without doubt very maths intense. I only made it through the first course thanks to help from my friends, some of whom are maths geniuses.
Not only is it advanced maths, but QM also has its own formalism (actually several) and notations. Unfortunately, maths are also very necessary to make any good use of QM.
As an example, I would estimate that my textbook on QM consists to about 50% of equations. In the chapter "The basic postulates of quantum mechanics" alone there are 90 equations. In the same course we also had another textbook; "Modern quantum chemistry, introduction to advanced electronic structure theory". The most important chapter in that book, the Hartree-Fock approximation, has 382 equations!
My most important lesson from the course? Stay away from quantum mechanics!