Cisco ASA 5510 Firewall Licensing for Gb Port?

Hello. In this building the network goes through a cisco asa 5510 firewall. Recently the internet was just upgraded and to take full advantage of the bandwidth, gigabit interface is needed.

There is only a base license on the ASA 5510 and I was reading a Security Plus license is needed to UNLOCK the port 1 gigabit interface capabilities. (really?)

My Question for anyone familiar with doing the upgrade of license, how easy is it to do this? Do I simply enter the new license key into ASDM, save config and that's it or does the firewall reset and everything needs to be reconfigured? Also, is ebay the only place to acquire such license now since the model is pretty old now? TIA

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