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d^2 psi/dx^2+d^2psi/dy^2+d^2psi/dz^2+8π^2m/h^2(E-V)=0

Where x= rsin(theta)cos(phi)

y=rsin(theta)sin(phi)

z=rcos(theta)

V=-e^2/r

When we convert Cartesian plans into polar planes, we get:

1/r^2 . d/dr(r^2.d(psi)/dr)+1/r^2sin(theta) . d/d(theta) (sin(theta).d(psi)/d(theta))+ 1/r^2sin^2(theta). d^2(psi)/d(phi)^2+8π^2m/h^2(E+e^2/r)(psi)=0

Please explain in easy steps, how to solve this?