I have a semi circle of uniform charge (Q) and length (L). I need to find the equation for the electric field at what would be the center of the full circle. I just need some help getting started, I know that by symmetry the y components will cancel (i have the semicircle upright on the left side of my y axis). but other than that i dont know how to move forward.

Am I looking to put the electric field equation in terms of r and \theta and then integrate twice? or can I put this in terms of x and integrate that way? BTW I do know the answer just need to know exactly how its done.