When somebody is doing something for your, providing a service, like cutting your hair, painting your house, mowing your lawn, or even checking your blood pressure! we use the expression “having something done” .
The formula is easy = the verb (to have) + the thing + 3 part of the verb.
i.e to have +thing+ 3
You change the verb (to have) to the tense you need:
I will have my hair cut tomorrow. I had the lawn mowed yesterday.
If you wish to express necessity or obligation; don’t worry you can stick in “have to” also i.e I have to have my blood pressure checked tomorrow.
Nice way of expressing yourself in English.
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