Bay parking looks fiddly but it is mostly about reference points and slow, controlled steering. Here is a reliable method.
Drive slowly past the bay you want, keeping a sensible gap from the parked cars. Aim to line your car up so you have room to swing in. Check all around, because observation matters as much as accuracy here.
Reverse slowly while steering toward the bay. Use the lines in your mirrors as a guide, and straighten up once the car is sitting square between them.
If you drift, stop, correct your steering, and continue. A pause to fix your position is always better than rushing it.
