I don't see why not, at the end of the day it's your own business HOW you're losing weight. Nothing says you have to be actually following WW to attend the meetings...as long as you pay, I don't think they really care! :P
Essentially, with WW you take a quiz (you will probably find it online if you Google it!) to determine your daily points target. Your target is determined based on gender, weight, age, activity level, etc., and you should aim to eat your target every day. In addition, WW also provides everyone with an additional WEEKLY points allowance of 35 points. These points are yours to use as you see fit - you can divide them up and add an extra 5 points to your daily target, you can use them all on one day, you can use only some of them on days when you're feeling extra hungry, you can decide not to use them at all if you prefer. I personally use mine, as they don't hinder my weight loss and I'd rather eat as much as I can while still losing - this only bodes better for maintenance!
You will receive a points slider that you use to determine the points value of the foods you eat. To determine points for a serving, you enter the calories, fat and fiber from the nutrition facts label. The higher in fiber and lower in fat and calories a food is, the lower the points will be - the higher in calories and fat, and lower in fiber, the higher the points will be.
WW also has what they call Good Health Guidelines - these can also be found online, and address how many servings of fruits/veggies, lean proteins, dairy, etc. you should be eating. Though your points are yours to spend as you choose, I far prefer to follow these guidelines as they really do promote healthy eating. If you eat according to the guidelines, the bulk of your points will be taken with healthy choices, leaving fewer points available for treats (a good thing, in my case!).
Tracking, as in calorie counting, is key with WW. If I track, I lose weight - if I don't, well, things slow a little. You can do a reasonable job keeping track in your head, but overall I find my best success comes when I keep a journal. It sounds tedious, but really isn't - over the course of a day, it's less than a 5 minute total time commitment.
If you have an iPhone or iTouch, there is an app called "iWatchr" that will allow you to journal on your device - it also has a points calculator built-in so you don't need to carry the slider around with you, and a food database where you can also add your own favorites.
You can also earn activity points, based on your exercise. Again, you can likely find the details online, or use the slider that is included with the week 1 information - depending on your weight, activity level, and duration, you can determine how many points you've earned through exercise on any given day. You can eat your AP's, or not - again, the choice is yours.
I don't know if this is a repeat of information you already have, or not - if so, sorry to repeat!! I'm happy to answer any questions you have about WW, so fire away! I only recommend attending for a week to get the actual printed materials in hand so you have them, and can get a feel for HOW you might like to do the program if you do decide to join (at home, going to meetings, online, etc.). You never know till you try, right?

Between asking questions and what's available online, though, you can likely get enough info to experiment with the program on your own if that's what you want to do.