I totally get your worrying. I am the IT at work (among other things. ;D ) We have Windows servers, cisco switches, etc. About three years ago I decided to buy a MB Pro and it has been like Alice in Wonderland - I fell down the rabbit hole and am loving it. So I have been slowly integrating macs into my workplace and home.
I purchased two Time Capsules, one for home and one for work. We have four macs that backup to the one at work and two macs that backup to the one at home. Since no one has a clue how to run any kind of network stuff at work I am allowed to do whatever I want....

;D
So when I added the Time Capsule to the work network, I set it up extend our wireless network. I was amazed at the increase in area coverage it gave me. I mean like WOW! I work in a very large church and I have it in the sanctuary upstairs soundboard/video area. It provides a nice strong signal to the large room under the sanctuary that is a large kitchen/ classroom area.
As for you setting one up at your home, you will use the Airport Utility found in the Utilities folder of your MB Pro. At home I set my Time Capsule up to bridge mode and let my ISP modem handle DHCP (assigning IP addresses). When I first set it up, I left the wireless "on" on the ISP modem. I named the network the same name and password on both devices. When I was sure the Time Capsule was set up correctly (no little yellow triangle on it in the Airport Utility) I shut off the ISP's wireless because it is "N" speed and the Time Capsule is "AC" - which is faster. It worked great.
Now the Time Capsule will not increase your internet speed if you have a slow provider like I do. Rural living demands sacrifice - like no new technological advances beyond the piped in sunlight!

But it should expand the coverage range in your house. It did mine.
If you decide to get one post back and we can walk you through step by step. It really is not that hard. For me it was changing my mind set from Windows to Apple. Sometimes I find myself getting in my own way because I can't believe it could be that easy. I keep waiting for the punch line. ;D
Lisa