In this tutorial, I will show you how to use a resize script to easily modify hair, this is especially useful if you're not that great with modding prims via the edit menu. I like using this script for hair fatpacks, since I want them to be resized 'the same way' each time.
Typically for me, most hairs are too small so the scalp shows through the prim. This script can be used to shrink or resize by increments of 1%, 5%, or 10%. The script I am using for this tutorial is the SRU Resize scripts 2.4 by Wietse Cassini. Look up the creator's profile for picks to his shop.

Step 1. Rez your hair on the ground (be sure to make a backup copy first!).
Step 2. Locate your scipt in your inventory.
Step 3. Right click on your hair on the ground, and select EDIT from the pie menu.

Step 4. Drag all 3 resize scripts (resize controller, resize distributor, and resize resizer) into the Content tab of your hair.
Step 5. Touch your hair to populate the script throughout the prims. The hair I'm using is Maitreya's 'Faye' style, so this is what the script whispered…
Maitreya Faye – Natural Blond: Beginning child script injection
Maitreya Faye – Natural Blond: Done
Step 6. Once that's done, delete the resize distributor script from the hair.

Step 7. Take the hair back to your inventory.
Step 8. Wear it and select the hair again by right clicking on it and go to EDIT, once the Edit menu for the hair pops up…
Step 9. Go to TOOLS on the client menu, and select 'Set Scripts to Running in Selection'. This step is crucial, if you don't do this the script will not work!

Once you have selected 'Set Scripts to Running in Selection' a menu should pop up that looks like this:

Wait for that to say 'done', then click on your hair to start resizing via the menu! :)

If everything was done correctly, you will be able to resize the hair via the menu and also the traditional edit menu at the same time.
This may seem like a lot of steps at first, but it'll be second nature once you do it a lot. I like to use this method when resizing fatpacks of hair for uniformity.
This tutorial applies to anything you want to resize, not just hair! I hope it helps! :)
