Hello Mac-ians

Is there anything to watch out for when upgrading a 68k Mac (a Centris 610, as it happens) from the System 7.1 to 7.5.3 (the last free downloadable OS on apple.com as far as I can see) ?

Is it simply a matter of pointing it at the files and it'll all be fine or is there a risk of a Windows-style upgrade hell?