Metal fence installation is better left to professionals if it's a large fence
Metal fence installation is a fairly easy process, it can be rather tedious if you're not sure what you're doing. If you're dealing with a very heavy fence, it might be best just to have a professional install it. It's not worth having a post off center, or every post off center just because you didn't wanna put out a little bit of money to make sure everything was perfect. If a metal fences installed correctly, it will stay there for ages. And, with a little bit of upkeep you can keep it looking brand new. The downside to metal fences is that they naturally look a little bit more industrial. If you're looking for a more natural homely look, then I would steer clear of metal fences unless it matches the motif of your home.