It would do you the world of good to jump out of your comfort zone and try new things. Everybody makes mistakes in life but then we learn from them through knowledge or wisdom, that's life. When you overcome your challenges, the rewards are so more appreciated. The only real challenge would be fitting the tank through the flooring and most garages would do that on your behalf safely for peace of mind.
I took down a conservatory 4m x 4m Edwardian style a few years back. Never had any experience before so I googled everything I could, there wasn't much but I managed it safely without breaking a single pane of glass and even transported it safely. I was really chuffed with myself after I done it all.