Mod rewrite and SSL

I need to change an SSL certificate on an account, and the cert is shared among a few sites (secure.domain.tld/~user/files...). I have a few questions about this.

Since you can only have one cert per IP, does a new one just replace the old, or do I need to remove then install first?
Secondly, once the new cert is in place, the sites using the old address will no longer function through SSL. Can I rewrite the 'secure' address through ModRewrite to the new cert temporarily, or will this show errors to the visitor?

 

 

 

 

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