First of congratulations! On your engagement, your baby and for breastfeeding! It really is difficult to lose weight when breastfeeding as your body naturally wants to maintain supply
How are your cooking skills? Can you change from frying to grilling or roasting, cut out sweets and possibly even bread and pasta? Meat isn't the worst thing so personally, I don't think that would be a priority to cut out. Maybe just cut down on the size and avoid fatty pieces/processed meats.
You know, in France they don't eat like we do: meat, starch plus veg. They are quite happy to eat chicken with just peas or green beans on the side. They just have a knack for making their vegetables taste delicious. Maybe, if you google healthy but yummy vegetable dishes you can cut down on starchy food like potatoes, rice and pasta?
Since you have so much weight to lose it really is a big commitment and will take a while to change your cooking habits but it is possible and maybe the breastfeeding 'advantage' will kick in for you. Don't lose heart!
I'm not the best dieter in the world but the couple of times I went for it I made sure I wouldn't go hungry so I planned in lots of snacks. Even a few naughty ones, but low in calories (chocolate wafer biscuits
). Try to drink mainly water if you don't already. Sodas and shop bought coffees have ridiculous levels of calories!
Maybe you could start a journal to keep you motivated and ask people to suggest recipes?
My favourite low cal meals are stir fry (here in the UK you can buy the bag of veggies ready chopped, same with the meat and sauce plus noodles - it takes just minutes to cook!) and vegetable soup (any vegetables plus onion or leek, add potato if you like it thick - chop veggies, add to pot along with a stock cube, cover with water and boil until cooked; then blend - surprisingly delicious!).
Sorry, I've really gone on about it now... I wish you all the best and a wonderful wedding next year!