Learn Dutch: De makelaar is klaar voor de bezichtiging. - The real estate agent is ready for the viewing.

You would use waar + voor. Because a viewing is a thing and not a person, Dutch combines waar (where) and voor (for) instead of using a normal relative pronoun. You would say: De bezichtiging waar de makelaar klaar voor is (or waarvoor de makelaar klaar is).

Bezichtiging is a long word! Is there an easy way to remember it?

Yes! Look at the middle part: zicht, which means sight or view. The verb bezichtigen means to view or to inspect (like a house), and adding -ing turns it into the noun bezichtiging (the viewing).

Does makelaar only mean real estate agent?

Usually, yes, when talking about houses. However, its literal meaning is broker. For example, a stockbroker is an aandelenmakelaar. But on its own in everyday Dutch, it almost always refers to a real estate agent.

Does klaar always take the preposition voor?

Yes, when you are ready for a noun, you use klaar voor just like in English. If you want to say you are ready to do an action, you use klaar om te + verb, for example: De makelaar is klaar om te beginnen (The real estate agent is ready to begin).