If you have a joystick then getting it through the slot is just 'line up and go in'.
Lining up: Fly to a spot at least 5k out from the slot and curve in until the slot is lined up with no side, upper or lower walls visible then just keep coming with enough roll to stay lined up (and lower your landing gear) It is OK to do this at 50 or even 25.
If you make a mess of 'curving in' then just stop (or go very slow) and use the maneuvering thrusters to move sideway/up/down until it is centred. That is no harder than 'press the arrow keys until this X is is in this box'. Anyone can do that.
On the old Elite in the 80s, joysticks would only give you a set roll rate faster than the station roll or a series of steps so keeping the slot horizontal was tricky. Also there were no side or vertical thrusters. This is why old-timers will give you no sympathy
Docking: If you find it tricky to stop exactly over the pad and lower onto it then slow down to 25 as you get closer to the pad and aim your nose at the bottom of the sloping ramp and 'fly' it like an airplane towards the near edge of the pad (just above the sloping ramp) at about 45 degrees. Reduce speed to 15 or 10 or even 5 as you get close then level out and edge forward slowly using the indicator to see how far you need to go before you stop. Use the side thrusters to get straight. Depending on what altitude you levelled at either the docking clamps will grab you when you are over the bullseye or you need to stop there and lower yourself gently.
Warning: If you use the 'fly forwards at low level until the clamps grab you' method then, at least on my setup, the engine settings seem to get remembered so when you go to launch again and the clamps are released you may find your engines set to 5 even though your throttle is closed and you end up grinding over the ramp. It is a good idea to be ready with vertical thrusters as soon as the clamps release.