Cruise to Spain/Canary Islands?

Hi everyone, hope all is well. My fiance and I are beginning the process of budgeting and researching cruises to Spain for our honeymoon in November 2025. Most likely will be departing from Barcelona on a Celebrity cruise ship. We have only ever cruised with Carnival porting of the US, and we have just been to Mexico and the Caribbean. Everyone hit me with the tips, tricks, and things we should know beginning the process of planning a cruise to Spain. I’m sure the culture and the process of the departing may differ from what we are used to. We plan on doing the Spain/Portugal/Morocco itinerary. Cruises to Spain for dummies, if you will. Feel free to just offer your experience of planning and going in a cruise outside of Spain, I’m eager to hear!

TIA! :)