Once you've looked and found a safe, legal and convenient place to pull up, you need to start the MSPSGL routine.
Mirrors - Centre and left - Make sure that no cycles, scooters, e-bike or e-scooters are trying to come up at the left hand side of you
Signal Left - As soon as your signal goes on, any vehicle behind will start to drop back expecting you to pull up or turn.
Position - Bringing it level with and reasonably close to the kerb, by using your focal point (Where the kerb meets the dashboard) and with your wheels straight rather than at an angle.
Speed - Slowing down gradually to a gentle stop rather than just slamming the brake on and doing an emergency stop.
Gears - Usually there is no need to change gear as you are slowing down - However you don't want to put the clutch down early and in effect coast to a stop.
Look - Make sure that you are stopping in the place you intended and not going to far down the road with the left signal on. This would be classed as a confusing signal.