Hmmmm.....yes, it is.
The actual physical taking out of the old and installation of the new is easy and should not be frustrating in the least.
What CAN be frustrating is the installation of the drivers and setting the soundcard up. However, a gentleman of your patience should have no problem
I would recommend you uninstalling the current drivers before shutting down and doing the physical stuff. Then follow the installation instructions......
What operating system are you using? XP? What card are you looking to buy? You really don't need to spend megabucks.
Does your computer have onboard sound? If so, this is perfectly adequate for gaming and other uses...I use it now after having soundcards for years.