I was lucky, I was plant based so no charging about in the car. We had the same contractors on site for years so had a good working relationship with them.
We were constantly altering the various plants so someone that knew the plants and process would get lumbered. The works was divided in to two sections I usually got roped in for our section of seven large plants.
It was fun at times, at times I was tearing my hair out!
The best part would be the commissioning trials. Will it work first time? Like hell it would! I was dealing with natural gas and pulverised coal, the sphincter would be twitching when it came to start up. Will it go bang? A few times it did!
I would say go for it, but go in withyou're eyes open.