I've installed many aftermarket radios before without disconnecting the battery and had to issues.
the only reason why I dont disconnect is i want to test on the fly so that I get the connection right the first time. I've never shorted or popped a fuse before... knock on wood!
However, i'm very carefule when making my connections to not short anything. If you're not confortable in installing a unit while connected to the battery, disconnecting it doesnt hurt.
my two cents.
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