Water or water+washing up liquid are lubricant for rubber - and washing up liquid on rims will actually improve the performance of rim brakes.I can remove 700c 23 and Mtb 26" tyres by hand unless hands are cold. A slight bit of alcohol hand gel on the rim before hand will help. Don't lube otherwise your rim brakes won't work.
The tyres that Julia is talking about are noted for being extremely difficult; putting them on sometimes involves the foot method, if anyone is interested I'll look up a post on another forum where I provided a long description of how this works.
Edit - I'm bored.
Here is a link to the method with my description and added pictures by someone trying it out.
https://yacf.co.uk/forum/index.php?topic=28167.0
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