ENBoost Installation

ENBoost will give a performance increase even to those with no intention of running an ENB preset.

 Make sure you have the correct directx9 runtimes. Actually installed not just extracted you can find them here.

1. For Skyrim 32bit get this
2. If you are using Skyrim Special Edition get this
3. Open the ENB binary archive and go to the "WrapperVersion" folder, then extract only d3d9.dll, enbhost.exe, and enblocal.ini into the base Skyrim directory (do NOT copy into the 'Data' directory!).

      4-1.If the Wrapper version doesn't work try the "InjectorVersion". Remove any existing remnants of the Wrapper version, and extract only the enbhost.exe, ENBInjector.exe, enbinjector.ini, enblocal.ini, and enbseries.dll files from the "InjectorVersion" folder into ./skyrim/. You must run ENBInjector.exe before running the game for the injector version to work properly.
You only need either the wrapper version or the injector version, the injector should only be used if the wrapper version fails to work. Were not quite done yet but before we proceed go and launch skyrim.

We should see that text at the top left if you don't go back and start again.

Next use the VRAM size test tool found here

Whatever value it gives you:

• If you are on windows 7 subtract 170 from that value

• If you are on windos 8 / 10 use the value given to you.

 In your enblocal.ini under [MEMORY] in VideoMemorySizeMb=

Is where you put the value given to you from the VRAM size test tool

Bonus

I've only tested this on Skyrim Legendary Edition NOT the special edition. Though I can't see a reason as to why it wouldn't work. 

Providing you have followed all the previous steps, go here and get ICBINE 3 (I can't believe it is not ENB 3)

Once it is downloaded, create a new folder on your desktop. And extract its contents to that newly created folder. 

Rename the d3d9.dll from the ICBINE 3 archive to d3d9_sweetfx.dll

Now open the enblocal.ini your skyrim folder. The top, proxy section should look like this

[PROXY]
EnableProxyLibrary=true
InitProxyFunctions=true
ProxyLibrary=d3d9_sweetfx.dll

Save and close the enblocal.ini.

Now the folder where you extracted the files to on your desktop copy all of the files to the root folder.

eg

D:\SteamLibrary\steamapps\common\Skyrim

DO NOT COPY IT TO DATA FOLDER.

Also imaginator is strongly recommended for ENB's. Wearable lanterns is sometimes recommended but depends largely on what lighting mods you install and what options you choose during installation.

Imaginator Skyrim Legendary Edition

Imaginator Skyrim Special Edition 

Wearable Lanterns Skyrim Legendary Edition

Check Out Some ENB's! 

At time of writing this, 5th January 2017 it seems wearable lanterns isn't available for Skyrim Special Edition. Keep a torch handy if you choose a darker preset or tweak the brightness with imaginator.

Here is some screenshots using this setup on skyrim legendary edition.

The STEP wiki is definitely recommended reading it covers more than what an ENB is and isn't check it out here