If you read this guide I suppose you already found the doorknob to get into the booth with the sliding tile puzzle and figured out that every tile represents a room in this area (so you actually slide around the rooms with that puzzle). Also I expect that you already explored the rooms a bit, if you want to find all the documents there. Yet I will lead to one better hidden document and a relic when it's time for them, these steps are named "Optional". You can get these additional items anytime later, until you leave the area obviously.

I cannot really help you with how to slide the tiles to get them into the neccessary order, because if you already moved them around the start constellation will basically be random for everybody. So in that matter only what rooms need to be arranged in what way will be part of the guide.

Your main goal is:
Get into Room7 (to take something from there) and then to find a way to leave. But Room7 has a locked door, so you will need to do some things first in order to open it.

Go to Room9 to takeone additonal tile/room. You'll find it on the small couch table.
Room constellation:

95
_2
or
49
2
. . . . . . . . . . . . .

Place the stairs (the diamond shaped stone in the sliding tiles puzzle) in the new Room3 and make sure you have access to that room. When you go upstairs you will find a document in the bookshelf.

Get the key from the gallery on the second floor in Room9.
Room constellation:

395
8_2
. . . . . . . . . . . . .

Now of course you can enter Room7, but there awaits you another puzzle.
Move the mirror from Room5 into Room7, directly in front of the other mirror.
Room constellation:

75
_2
. . . . . . . . . . . . .

After taking the dagger and going back through the mirror, the rooms have changed alot. If you now place the stairs into Room8 and go upsatirs on one of the sides (depends from where you enter the room), you will now find a relic there.

Now you need to leave the area througha mirror on the second floor of Room4.
Room constellation:

4
2
6
. . . . . . . . . . . . .

Yes, it's a bit more difficult then just to walk there.
Room2:For the start I hope you atleast gave it a first try yourself, if not I encourage you to do so now.
Well obviously you cannot just run past that mirror. In this room something broke, which allows you to do something you couldn't do before.
I mean two of the statues on the lower floor that were in a glass cabinet before. Slide them into the the middle of the gateway to the nextby rooms to be able to jump over them to the right gallery and then back on the left one.

Room4: Here is no preparation needed, but it's not that easy figure out which way to use, where to go and the jumping part is also a bit tricky.
Instead of a long text, that you probably anyways wouldn't be able to follow, I recommend this video from CjuGames. It will start directly there if you use the link below and he will make it at the first try.
https://youtu.be/sa2jg1ZABMU?t=7m