Hi and welcome, SeaDragon
Losing a lot of weight may seem daunting, but it is certainly doable.
For many people it's just a matter of doing little modifications to their lifestyle, such as not having a bowl of icecream, of eating a vegetable instead of a pie, or not sitting down in front of the telly and going for a walk instead.
Doing these little things each day, day after day after day after day, is the tough part, but it's the only way to form good habits.
There are plenty of useful articles on the main website and past discussions stored in the forum so dig deep, there's lots there. You'll find both encouragement and education here. A final thought - it seems to be increasingly evident from reports both medical and anecdotal that sustained weight-loss and weight maintenance is as much psychological as a physical process, so don't neglect that side of things.