It's not that bad. Most of the problem is moving AND setting the new tank up at the same time. I would have prefrered to move & then plan out the 125g install better. But I'm going slow, tank has been up & running over 6 weeks now. I'm making progress in the fish room.
Just glad it's winter, I wouldn't want to be doing all this & "trapped" in the house during the summer. When I go to setup the 180g I'll be doing a lot different.
Good learning experience