Since a lot of posts are talking about the hows, and that’s not what you asked…
I don’t think 1.5 pounds per week is necessarily unrealistic. It’s entirely possible that you’ll do that. In Weight Watchers, they describe average weight loss as .5-1.5 pounds per week.
On the other hand, when I lost weight, I averaged about a half pound a week. It took me a while.
So while it’s possible, it’s not a given. And it’s a real easy way to set yourself up to feel like a failure.
Weight loss depends on so many different variables (hydration, food intake, exercise, medication, metabolism, etc.) that it’s not the best way to goal set on a weekly basis.
It’s a great way to judge progress, but setting goals of losing 10 pounds (without a time frame), or going down a clothing size, or some other such goal is probably a better way to do it.
Good luck to you, and if it comes off slow, at least it’s coming off!