All you need to get started is software to download the Linux operating system (eg https://manjaro.org/download/plasma) put the iso image onto a USB stick. I haven't tried it but this looks ok https://www.lifewire.com/how-to-burn-an-iso-file-to-a-usb-drive-2619270
Then you enter the 'boot menu' at startup of computer, normally by pressing F1 or F10 (search will tell you what to press for your machine) and boot from usb
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