Skyrim mods and installation times

Aug 14, 2014
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My build is nearly finished - http://uk.pcpartpicker.com/user/nortycrosal/saved/#savedbuild_1368885
All that needs to arrive is the graphics card. I have installed Windows already as well as Steam and Skyrim. My question is this. If i start installing mods now, as in before i have the video card, will there be any adverse effects on gameplay when i actually begin to play Skyrim once the graphics card has arrived and is installed? Should i wait for it to arrive before i start installing mods? Many thanks in advance.