if you want to do it, then do it
with your attitude at the moment you'll probably do well in it
To get a tutor or not is up to you. Some people learn better with a tutor, some can learn from their teachers...etc
i think he means integrate with respect to r and then rearrange
if you have the initial conditions to find c, find c
if not, then just move c over as its just a constant
not sure what you mean, but in the first example this is what you're doing
x=\int \frac{1}{2x}dy
you cant integrate 1/2x if its dy
the second example is pretty much correct