defeatist attitudes are a big reason why success eludes people in the lower tiers of content.
Here's what you do: You set aside some time for doing the content you want to do. It can be any amount of time. But for that period of time, you spend it forming a group. You do what it takes to get in there and get your experience. If people leave, you replace them. If people screw up the same mechanics repeatedly, you replace them. If people learn quickly, follow directions, and are good to be around, you friend list them, add them to your LS/FC, or join theirs.
Endgame content is difficult. it requires coordination and study. You need to go out and make friends willing to do it. And that's by design, and has been since the first MMO raids.