Good or bad idea for running 4.2.X update?

[pityocamptes]

Was going to create a folder on my server, upload the entire current site contents to it, perhaps password protect folder? Then clone the db and point the "new" site to cloned db. Try to install the new 4.2.X version and see if I get any issues. Don't really want to run it on a local host, too much of a PIA. Anyone see any issues doing it the way I plan? Also, all I need to do is change the config file and any htaccess stuff right, for me to get into the "new" test forum... thanks.