The PSU and graphics card will work fine with what you have. The PSU has 4 6+2 pin PCI-E power connectors, you'll need only one. The reason they say 6+2 instead of 8 is that the extra two pins can be broken away, so you can use it as an 8 pin PCI-E or a 6 pin PCI-E. Most 750TI's don't require the additional power (ie gets all the power from the card slot), but this particular card is factory overclocked and thus requires the additional power. The PSU is partially modular. Some connectors are permanently wired to the main unit. These are the ATX cable (motherboard), 4+4 CPU connector (also motherboard), and 2X 6+2 PCI-E power connector (you'll need one for your new graphics card). You'll have to add the cables for your drives and fans. Modular is nice since you only need to have the cables you need for your system inside the case, no tiewrapping cables back that aren't needed.
As for help, no problem. I do go back to work here soon, so my internet access isn't quite as good in Yemen as it is in Canada, but I will get back to you. Who knows, when you get around to getting all the parts, maybe I'll be back home 😉 . I don't think you'll have much trouble installing the fans, they are pretty straight forward. The power supply might seem a little daunting, but as long as you take some pictures of where your old power supply plugs into all the parts of your computer (motherboard, HDD, ODD, etc) then you shouldn't have much problem installing it. The fun comes trying to hide and tidy up the wiring. This is important since a big wad of cables will impede airflow. The graphics card is just really making sure to follow the correct procedure to uninstall the old drivers correctly, so that you don't have any leftovers when you install the new card.
Give me a heads up when you order. One thing about ordering a few pieces at a time, you'll get to test each change on it's own. I would leave the graphics card until you've upgraded the PSU though. Since it's possible that your supply is shaky, it would be better to only be used with your new more reliable power supply.