First off let me say out of all the methods Ive ever tried, this one
akes the most sense for that matter it works and you wont spend the
rest of your days cussing out a pony half rooted pony head. The only variation
to my method than the one described here is the needle I use you can pick
one up in our store! It is very long and you dont need pliars!

You will need the following:

you will need a needle with a large eye (it just makes things EASIER)

some strong thread or fishing line or DENTAL FLOSS! :p

The pony you want to rehair with the colour of hair you want

Make sure with the thread you have a HUGE loop...From the outside push your needle into the desired hole

See your large hoop is now at the base of the neck..make sure it is sticking out a bit

Pull the ends of the thread from the top of the pony

Almost done just wiggle the hair a bit and the rest should come out

And WALLA...you have your first plug... Continue the steps and you will have a full head of hair in NO TIME

Hope this tutorial helped you!!!