1) Find and collect your gear

2)Acquire the Golden Grin blueprints
This is the archive room

3) Scan the blueprints and fax them to Bain
When you found the blueprints you need to go to the server room and scan

4) Find and collect a memory stick

5) Download the guest list
Go near to the wall and bunny hop.

6) Upload the guest list

7) Find the guest inside the gambling hall

8) Find and spike the correct bottle
You need to see the colour of his drink, then you use the poison in the bottle with the same colour

9) Give the guest the spiked drink
Kill him in the bathroom, bag his body and drop it in any toilet

10) Pump the sleeping gas into ventilation
You need to go to the 2nd floor and find the correct room with the guest keycard

11) Wait for the poison to work

12) Disable the vault lasers in the security room
Everyone there are sleeping, just come in and hack

13) Get into the vault

14)Secure the Dentist's loot

And finally escape