It's not as complicated as you might think.
Read the tutorials and give it a try.
There are also excellent videos you can watch, I recommend the Polyface Farm (Joel Salatin) videos on YouTube.
As long as you bleed it well, scald it well (for plucking) keep your work area as clean as you can, rinse it well, then chill it fast (dunk it in a big pot or sink full of ice water), there's not much that can really go wrong.
Just avoid cutting/puncturing the intestines, and avoid breaking the gall bladder. That's the worst 2 things you could do, and they are fairly easy to avoid. Even if you got a spot of poo on the tail or something, you can wipe it off with a paper towel, and then trim that part out. Same with the gall bladder. And if you hold the liver over the discard bucket to trim that off, the most you can lose is the liver.
Beyond that, the worst that would happen is you end up with a funny-looking bird, with maybe oddly cut pieces. So what, it would cook the same, in a crock-pot, which is what you want to do with a 4 month old, or older, roo, anyway. Once the birds cooked, nobody will know what looked like when you were done.
It may be more trouble to find somebody to process one bird, than it would be to learn it yourself.
Good luck to you!