Introducing two female guinea pigs: HELP ASAP!?

[Christine]

So I have had my guinea pig Tinkerbell for about 3 weeks. She was caged with other guinea pigs when I got her so I know she's very social. She's a little skiddish, but i'm not sure if thats because she's still getting use to me, or because thats her personality. Well, I decided to get another piggy so she could have some company. But I didn't do research on how to make them meet, so I just put my new piggie Buttercup in with Tinkerbell. There was no fighting so I assumed it was ok, they made some sounds. Tinkerbell did more of a high pitch squeel, like she does when I hold her, and Buttercup did the same, but it was a little bit deeper. I'm not an expert on this but at this point I assumed these were good sounds because there was no fighting, they just sniffed each other out. I also did not put them into a neutral area. I just but Buttercup into Tinkerbells cage. And then Buttercup started mounting Tinkerbell, I found this odd becuase Buttercup was in Tinkerbells territory? After about 10 minutes of this I seperated them. Tinkerbell squirmed around while Buttercup was mounting her, but she would follow her around as if thy were friends. I am very new to guinea pigs so I just want the best for both of them. I want to know how to do an introduction PROPERLY, since I failed the first time.

This is my plan, please let me know if this is good, or what I should do differently:
Create a neutral area with neither of their scents
Have plenty of foods to keep them distracted from each other
Have a towel ready in case they start to fight

Also, when I introduce them next, what signs can I look for to see if they can get along or if they are just a bad match. Because if they are just a bad match I can take back Buttercup and try again with another piggy. Thank you for any advice
Thank you guys very much. I'll let them meet a couple times before I leave them unsupervised.
There was no blood drawn, but Tinkerbell did not like the mounting AT ALL, so i just seperated them asap so a fight didn't break out.

 

[Doodle Bob]

This is very normal. they are just establishing the dominance. the one on top will probably be alpha. you only need to intervene if Tinkerbell retaliates, as some guinea pigs don't like this.

 

[purcellj84]

Guinie pigs are social animals and do better if pairs and usually tend to get along on their own. If there was no fighting I think they'd be ok together. It may just take them time to get to used to one another. Id make sure buttercup isn't a male or you may end up with babies from the way it sounds. When I got my second pig I just stuck her in the cage with my first one and they did fine together.