It’s most likely youl be using Trinity terminal or Languard (aka 9 berth I think, always Languard to me and I’m ■■■■■■ a bit so can’t remember even though I was there yesterday).
Anyway Trinity (TTY) is dock gate 2 Languard is dock gate 1. No matter youl get there in the end.
Right so now the fun begins, depending on your time slot youl either be queueing for the canopy terminals or straight in.
Stop under the canopy at the stop sign, undo twist licks here or if there’s a queue do em whilst waiting.
Now then under the canopy there is computer terminals, best to have Rhides card in hand and paperwork, VBS details, box pin number.
Follow the on screen instructions, after language screen insert Rhides card and then there’s a hand scan thingy. Then youl be asked for the VBS number and your registration.
Next screen will show collection box number then once confirmed you will be asked for the box pin number, 7 digit number.
Right whilst this is going on a nice bloke in an orange hi viz will be checking your box if your bringing one in.
The screen will say ‘Awaiting completion of checks’ then it will say click accept and remove Rhides card.
Now after this there’s a slight glitch where it may say scan Rhides card, wait a sec and a printout will be churned out the slot on the left.
Bingo your in, if there’s an issue ask one of the chaps in orange for assistance.
OK so if all’s gone well you should have a little printout in your hand with location details that may say something like:
D140F2
Ignore the last F2 bit as that’s the box position in the stack.
The D140 is the important part.
Go to your map and look for the 140 position then go down section D and hey presto you should be close.
If there’s no crane in place try and line yourself up with the boxes as the crane will expect you to move as its dropped down on your twistlocks.
Don’t panic though the closer the box is as it comes down the easier it is to see.
Usually I’m pretty close to bang on as I’m in their a lot but sometimes I mess up, don’t worry just take your time positioning yourself to the box as it hovers over you.
Tip: Raise steering and lean out the window.
Tip 2 : Also check box number as its on the way down.
Tip 3: Once loaded ensure handbrake is on. Get out and check it’s on all the locks, then give crane driver the thumbs up.
Tip : Check crane us clear before pulling away, tbf the crane maybe long gone by this point.
OK now head for out gate, there’s signs on the cobbles for way out but if un doubt follow another truck.
Tip 47: if in doubt ask.
Once at the outgate canopy the checker will check your box seal and you can do up your licks and check it also.
If you want to look pro use the overhead mirrors to see the roof.
Now very important you will need to scan your Rhides card again twice then proceed to security exit who will let you go on your way, if you haven’t scanned your card you will have to go back in.
Hope this helps as its just a rough guide theres loafs more but it’s more than I had for my first time 
Oh I should add if your collecting your Rhides card from the police pass office best way is ■■■■ gate 1 straight over roundabout then on the left, ask my mate Sid the seagull he is usually around there most of the day.

Oh and time on dock, fastest I’ve done is 25mins longest is 4 hours. Shift change at 7 am and pm, so expect delays if caught close to these times.
There’s also THA (temporary holding area) if you have to go there it will be on your ticket. Unfortunately my tickling finger is tired but there’s plenty of drivers to ask if you should need help there.
I won’t be at Felixstowe till Tuesday.
Oh and in my time I’ve done almost every cockup possible so don’t panic but crucially ensure twist locks are undone before unloading and haven’t bounced down whilst travelling to position empty.