My wife and I have been together for 30 years now. She always knew I was TG to some extent but not all that 'Thrilled' over it. In the beginning.... I needed my monthly or so escape from maleness by cross-dressing. TBH, by the time we got serious I had given up on 'My dream' and reluctantly settled for being a TV++ after two failed experiments. That denial combined with plenty of diversions and distractions (the 3 D's) worked in a way for me for a long time. That is until the excrement hit the air handler, yet again, for me.
I dropped the T-Bomb on her about 5 years ago now. Her initial reaction was not all that good. Over time things improved. Transition was not, and is still mostly not, on my RADAR. Nevertheless, it took a long time for her to get over the feelings of betrayal and being able to trust me again. Over time she also saw the results of the hard work and personal growth I've been undertaking.
'Getting By' now consists of my TG group meeting, therapist to help sort out things still since I have LOTS of baggage to unlearn, HRT which was my wife's suggestion several years into this process, and importantly being able to see myself as Joanne to some extent each and every day. Something my wife now is pretty comfortable with to even worried if she doesn't see her. (I'm known for my WTF am I doing??? meltdowns)
Overall, time, plenty of open and honest discussions, and baby steps can help in changing attitudes. Being honest also applies to oneself which is where my TG group and therapist helps. I make a great living having fun solving problems, yet I have been miserable at solving my own, often getting stuck in a bad rut or just plain not keeping an open mind or even seeing other options.