character set migration

Hi,

I encountered the demand to store the euro sign. With the current character
set impossible.
So I have to migrate to a new one. Docs state 
alter database character set is possible when new character set is a
superset.

Alternative is to export and import which is not a realistic at this time
for this organization.
I have 2 questions:
1) My current character set is WE8ISO8859P1, I understood WE8ISO8859P15 does
contain the euro
sign but is this a superset? 
2) Any experiences with alter database character set? Is this a solution
without risks? I have about 3 tables
with either long or clob type fields so I might have to export and import
those only, but these are not about currencies so
should I export those?

Hope you can shed some light on this,

Tnx,

Jeroen

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