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arparaspolo is exactly right. Rooting the D3 is a one click method.
First, charge your battery to 100%, this is just a preventative measure.
Download Pete's Moto Root Tools (this link will start the download of the .zip) and set it up.
Once set up, double click the green icon to open up Pete's Motorola Root Tools.
Grab your phone and go settings-applications-development-USB debugging and accept the pop up if it isn't already enabled.
Connect your phone with the provided USB cable and set it to Charge Only Mode.
Now, click Root My Phone in Pete's Moto Root Tools.
This will go through 3 steps as narrated in the application. Do not unplug the phone until it says it is done. There will be a "You're liable for what you do to your phone from here blahblahblah" warning because rooting gives you the power to brick your phone, although rooting with this program will not. (I've used it a dozen+ times flawlessly)
Now, once your phone has done all its reboots and you get the all clear from the program, you can unplug your phone and head over to the market. I couldn't find Bloat Freezer in the market, but I think I'm also on a different market version with Liberty ROM 2.0 (market 3.4.4). Regardless, I suggest spending the $5 and change to buy a Titanium Backup license. IMO, this is the best root app. From here, you can freeze apps, back up apps, their data, and all system settings, select which apps can auto update, move apps to and from the SD card, uninstall apps, and schedule daily backups of any thing on the phone. The best part is that if you ever mess up your phone, the backups are stored on your SD card and can easily be restored.
The following may sound scary, but the chances of you needing it are next to nil, I'm sure arparaspolo can attest to this.
Now, before you try rooting, although it's rare to ever have an issue with the program, I suggest downloading the MyBackUp Trial from the market and running that prior just to play it safe. If you somehow brick your phone with the root tool (I don't believe there is a single case of this happening in the rooting tool's 10 page thread over at XDA), just go to this link to unbrick your phone in about 5 minutes. This will restore you to box-stock and then you can simply restore from the MyBackUp file and be back where you were.
Once successfully rooted, I suggest heading into Titanium Backup and backing up "All user apps & system data", or go one step further, and download and install a bootstrap application, then create a Nandroid backup. I can elaborate on this more if you want. Essentially, it backs up EVERYTHING. It basically takes a snap shot of your phone at that moment (including the stock software, apps, data, etc.) and saves it in some zipped files on your SD card.