How does everyone feel about being a developer in the Salesforce stack? I am about to graduate from University and head to a company where my team will be working exclusively with Salesforce and I am not sure exactly what to make of that fact.

I have a professional edition org and i want to set sharing rules on Opportunity Object  which is not available. Hence i am looking to go for Apex Managed Sharing. Would it work . If yes please help me with the solution.

Its urgent