As John has said, installing any PCI card is very easy. Firewire is even easier than most as there is no software that needs to be installed for it as everything that is required for it to work is in the Windows install - as long as you have Windows 98
SE or later.
It really is as easy as removing the cover to your PC's case, removing the blank plate on the rear of the case a lining the card up with the hole in the case and pushing it in. Put the case back together and your PC has a firewire port.
Don't bother trying to use USB to capture your video, it is not up to the job and will cause a big loss of picture quality. Firewire is the only way to get the video off the DV tape and onto a PC or Mac with 100% quality.
If you are running Windows XP then that has a program within it called Movie Maker 2 (version 2 is part of SP2). It is a very good and easy starting point for video editing and full help with useing it can be found
Here. However you can't use this software to burn a DVD, to do this you will need extra software such as Ulead DVD Movie Factory, and a free 30 day trial can be downloaded from
Here.
If you don't have XP, or just want a more advanced editing program then all of the following are popular, cost around £40 to £50 and include DVD authoring tools:
Adobe Premiere Elements
Ulead Video Studio
Sony Vegus Studio
Pinnacle Studio ( be ware that this is unstable on many PC's and keeps crashing)
All of the above can be downloaded for a free 30 day trial from the relevent companies web site.
Good luck with getting everything sorted. Feel free to ask any more questions that I'm sure you will have as getting started on video editing can be very daunting 'till you get your head around all the technology and terms used.
Mark.