One thing I've learned at 72 is the longer you put it off the harder it will be. When I first started the "battle" , I set very minimal goals. I got a personal trainer and started. She gradually got me going and we modified my goals to a more aggressive approach.
One thing I did myself was to start my eating modification with simple portion control. Smaller portions, almost no seconds and desserts. Cut my alcohol down, only a beer or 2 during the week and almost no other booze. My goal was to lose 1# a week. Ended up at 2#.
Still really watch what I eat and drink, go to the gym and walk 3 to 4 miles daily, all year when the weather permits. After getting lazy for years, things have gotten a lot easier in the mountains (for an old man!) and I need to stay with the "program" if I want to keep doing this into my 80s and even older!!!
The real problem is lots of problems with my joints that I abused for years when I played HS and college sports. Can't do a lot except get them fixed if possible and keep pushing. Have a new knee and probably will need an ankle soon as my recent ankle surgery revealed.