We have done it with and without for door sized openings. Sometimes you may need one, two or even three props depending (as the chaps have said) what is happening above.
Worst case you will need to prop joists and have a strongboys prop handy to secure the brickwork too. Maybe even have a prop spare to help press the lintel into place. We have our own props and Strongboys so are free to grab what we need when we need it.
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