Never set a real goal before....

It's doable as long as you set your mind to it, and keep at it! It will be tough especially if you are just starting but you will get the hang of it and succeed! One thing I would also consider is taking measurements (especially if you plan on exercising through this). Muscle weighs more than fat in that if you have 1 cubic inch of muscle it will weigh more than 1 cubic inch of fat. So as you exercise you may not see the scale move but you will see inches coming off which can be just as good if not better!

I also set mini goals for myself. Like once I hit 5lbs lost I could get my nails done, 10lbs lost new shoes, etc. Some people even do tip jars for themselves so every lb lost a dollar in the jar then at the end when you reach your goal you can spend it on whatever. I found that mini goals made it seem a lot easier because they were baby steps instead of a huge leap.

measuring tapes are about $1.50 at a fabric store, highly recommend

So here is the crappy thing about all this weight lose stuff....I don't have a scale or any measuring device. Don't know if I'll be getting one soon because I'm pretty poor and I'm saving for this vacation to see my best friend.

There is a scale at my bank that a lot of my friends use for free! Or at the YMCA or a lot of places - your doctor's office - anywhere. Good luck!

Your biggest driver for weight loss is going to be diet. Eat healthy, eat enough, don't eat too much and try to hit your macros.