OMG! The good news is, in 3-4 weeks, she'll probably have grown out completely and she should be shedding out her summer coat for winter anyhow. I'm with everyone else, if you can get a pro to fix it and teach you, it would be well worth the money. If not........can you get the vet to sedate her for you? That way you could get in there and fix things without her wanting to kick. If that won't work, can someone lip chain or twitch her for you to get the kicky parts done?
You shouldn't really clip so close into spring but I actually think she is salvageable
Get a professional out, have her sedated and then give her a really good bath
Failing that putting some extra rugs on her will encourage her to shed faster though I'm afraid you have probably clipped into her summer coat now
Oh well - could be worse, at least she still has 4 legs!!!
Practice clipping on a dog or something smaller you can hide. When I started clipping my dog myself, because I'm cheap like that, she looked like she got caught in a lawnmower. So I put a sweater on her and called it good lol. Now 3 years later, and having to clip her monthly, I have gotten much much better. She on the other hand has gotten more impatient and more of a twit about it.
Good clippers are worth the money. Mine for my dog are already wearing out again, they get too hot to fast. And I maintain them as the instructions say.