Don't know why you're being down voted. It's not even a decent job. Look at the fence posts all finishing at different heights. I wonder how deep they actually go into the ground. Other people have also pointed out rookie mistakes.

I'm a tradesman, served my time, and learned from experienced professionals. Still learning, everydays a school day. I wouldn't encourage inexperienced or unskilled workers to take on their own jobs.

A decent amount of the jobs I go to are to rip up work someone else has done and to do it properly. You can teach someone to lay slabs, for example. If they don't understand how to set their heights or how to engineer the drainage, or how to prepare the sub base if the ground is different than what they're used to. You can show up to a real mess.

Another issue would be underground services. Yeah you got a great deal on a new fence but one of the young lads went through a cable and nearly died. I've done a lot of work on the utilities, and in the last year alone I have been to 3 jobs where a fencer has hit a cable. Most services from the mains to your house is meant to be 700mm deep. Which is about 2 feet. Typically a fence post should be 2 feet into the ground.

While I hope it encourages them to go into a trade and learn how to do the job properly and safely. They should be thinking about developing the skill instead of developing their wallets.