This process could be a lot simpler, but I wanted to link to you official sources so you would know it's not some virus crap.
Download OptiFine 1.14.4 HD U F3 from https://optifine.net/downloads
Download Faithful texture pack from https://faithful.team/files/releases/1.14.4-r4.1.zip
Download Sildur's Vibrant shaders v1.23 Extreme-Volumetric lighting from https://sildurs-shaders.github.io/downloads/
- Press the Windows key and R together to open the run dialog
- Type in %appdata%
- Take a copy of the .minecraft folder as a backup
- Go into the .minecraft folder
- Put the OptiFine .jar file into this folder
- Run this OptiFine jar file.
- Just press install, no need to change the folder.
- Go to the resourcepacks folder
- Extract the 1.14.4-r4.1.zip file into a new folder here (name doesnt matter)
- Check that inside this new folder is a pack.png, and that its not a folder in a folder. (.minecraft\resourcepacks\whatever\pack.png)
- Go back up to the .minecraft folder
- Create a "shaderpacks" folder
- Extract the Sildurs Vibrant Shaders v1.23 Extreme-VL.zip file into a new folder here (name doesnt matter)
- Check that inside this new folder is another folder called shaders (.minecraft\shaderpacks\whatever\shaders)
- Once thats done, open the minecraft launcher. you should notice in the lower left the profile is now called OptiFine
- Start Minecraft
- Go to Options -> Video Settings -> Shaders
- Click on Sildurs Vibrant Shaders
- Click Done
- Click Done
- Click on Resource Packs
- Mouse over the 1.14.4-r4.1 line and click the Play button in the icon
- Click Done, Done, and you're done :)