How often should I step on the scale??

I do my official weigh in on Tuesdays. Only because that is the day that I officially started MFP. I also look at the scale during the week... just because i am curious.

I weigh in fridays and mondays. since the weekends are my rest days, i like to see how far i've come during the week and if i slipped up during the weekend. i only record mondays weigh in.

I weigh myself on Mondays to remind myself to work out on the weekends.

With me being new to the program I really enjoyed all the different suggestions to the best timeto weigh in. It really does help to know that there are others out there with the same questions.

I weigh myself way more than what is recommended, i.e more than once a day haha!
I know it's stupid and meaningless but i just can't seem to help myself. So long as you don't let it discourage you when put on a few decimals it's not the end of the world. I have been up and down at least a lb or two over the past six weeks. The general trend is down though.

I'd also like to add that I will get on and off the scale 3 times each weigh in to be sure the results are accurate and the scale is not fluctuating between numbers

There's no need. That is a precision piece of equipment, and can accurately take a simple weight reading with a variance of +/- 0.0002 pounds. That's on the days when your weight goes down.

On the days your weight goes up, get back on that scale. Do it as many times as it takes. Sooner or later the scale will surrender and give you the reading you want.

You can have quite a bit of day-to-day fluctuation weightwise due to water retention from sodium intake, clothes you have on, time of day you weigh (I.e. Did you weigh right after a meal that's stil digesting? Right after you "eliminated" said meal? etc. etc.). and your monthly as a female (bloating).

My advice:
It depends on how much you "freak out" about fluctuation. If seeing the number go up a couple pounds will make you feel like "It's not working, I might as well give up!" then weigh once a week, same Bat-day, same Bat-time, same amount of clothing, etc. If you're OK with watching the number move and can accept that you want to get a better grip on what makes your weight go up and down in between, weigh yourself more often.

I personally weigh whenever I feel like "checking up" but I only take the once a week number (Saturday, first thing in the morning...) as
"gospel".

I'm a little OCD about watching everything. I admit I have a spreadsheet with my calories and daily weight, along with average calories since I started, "expected weight loss" as well as average and total weight loss per week everyday (Tues-Tues, Weds-Weds, etc). I started on a Tuesday, so no surprise that amount is the most. I average those all out to find my "true" weight loss. If I didn't, my weight loss would be highly dependent on what day I chose to weigh myself. Tues-Tues for example, I'd be down approximately 8 lbs in four weeks. But, Sat-Sat, I'd only be down like a pound in total.

My weight goes up and down quite a bit, and I don't really find it discouraging. As long as the trend is down, that's all that matters to me, and so far so good. We'll see if that changes how I feel.