hi Ben another thing to consider contact the boiler manufactures and ask about training has a service engineer, everything is provided tools, van, clothing and quite a good wage, whish I had done it years back , semi retired now so to old.
We recommend uHeat for Underfloor Heating Systems, and The Wetroom Store for all things bathrooms and wetrooms. They provide discounts for forum members.
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.