On graphing polar functions

I've been teaching myself Calculus II and polar coordinates are giving me the hardest time. I know there are two methods for graphing a polar functions, you can compile a table of values or you can refer to the Cartesian graph of the function itself. For I have been trying the latter method to no avail. The problem is I don't know in what increments to label the x-axis for the graph. People usually say set and solve for and that's how you get your increments, but in this case I get funky answers. Someone please.