1. https://www.nexusmods.com/skyrimspecialedition/mods/6194 Install following the instructions. 2. Go to the mod page you want, perhaps after googling "top 10 mods to improve character looks", for instance... https://www.nexusmods.com/skyrim/mods/7887 3. Go on files and click "Mod Manager Download", the mod manager you have installed on step 1 will open up. On the right tab, at the very end, there is "Downloads", wait for the mod to finish downloading then double click it to install the mod. 4. Installed mod will be displayed on the left, click the checkbox to enable it. Modding takes effort and a lot of trial and error, there are other tools such as "LOOT" to ease up the process but the bigger the list gets, the more likely for it to cause incompatibilities, etc.