Getting a quality group together is the hardest part of the raid. Trust me. Trust us who know. We learned the hard way with Oryx. Do not be fooled by high light level. They may still suck.
Some of your friends will not be able to hack it. Don't worry. You'll still be able to play with them. Just not the raid. It will take them until close to the next DLC to beat the raid. They may never complete it.
Lfg can be your friend. Even if you're in a clan right now, or joining one. Lfg can and has at times been better than friends you've played with for years.
Destiny's raids are challenging. They are, in my opinion, the best video game content out there. I love them. But please for your sakes, don't give up because of a crappy team. Seek out others who can get it done. And then, only then, can you Sherpa your friends.
GL guardians.
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Patience...some time to learn from mistakes and a general lack of assholism is all you need to finish group content