I've got a few bikes that I've put together. It can be fun but it's hard to argue that it's time or cost effective. I've paid for professional help for things I don't have tools or qualifications to do.
Also, I'm with the crowd here saying first adjust your bike before giving up on it.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."