Yeah, a lot of people want to buy a wfp setup right away. So they go into debt and the thing sits there for months before you get the jobs to use it. And then there’s a learning curve because it’s not a magic brush, you have to know how to use it and how to read the glass.
I’d suggest getting some work then grow into the wfp. If you have to do the building with a ladder first time, then you’ve got some cushion to by the system and pole.
Depending on your TDS you might be able to get by with just a DI tank and a pole. Get a cheap TDS meter and take readings around your town. If it’s less than 100, a DI tank will work and it’s cheap.