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Yeah, based on the year/model, it ranges from like 5 minute job, to rather involved, to impossible.
 
OP:
Which MacBook Pro?
What year was it made?

Without this info, you'll get no concrete advice.
 
first you probably need a pentalobe screwdriver
then go to ifixit.ccom to see if your beloved MacBook can be upgraded.
just make sure you disconnect the battery before swapping drives.
have fun!
 
Yeah, maybe they forgot they posted, or maybe they got busy. No point in providing any more advice if we don’t know what machine we’re talking about.
 
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