Depending on where you get the Grolsch bottles, the vendor/LHBS could assemble them for you. They are NOT difficult, since the tops come assembled, and it's just a matter of putting them on (two ends of thick wire into the dimples, DONE)... I usually get the fresh bottles next to my chair while watching TV (and having a home brew) and put them together for use the next bottling day. Once they are together, you don't need to take them apart. Every 5-6 brews, you'll probably want to replace the gasket on them (no biggie there either)...
One of the other advantages of the Grolsch bottles is their size... 16oz as opposed to 12oz... Means you can usually fit a 5 gallon batch in abou ~30 bottles... I have a couple of 1L sized bottles. Using three of those, I used 27 of the 16oz bottles for a 4.5-5 gallon batch... With Belgian bottles, you can use just 24 for a full 5 gallon batch. You just need to properly cork and cage them (not bad once you've done it one time)...
Another advantage of Grolsch bottles is you can fill them with, holding the bottle with one hand (the wand in the other) and close them as you move them away from the wand... No need to go back with a capper after you've filled them all. I think it's so much easier, that it's worth the few dollars more they cost... Although, to fill the same volume with home brew, you'll probably end up spending about the same amount of money (getting new bottles)...
I will say that I'm more reluctant to hand out my bottles than if they were 12 ouncers... I have to make the people promise to return them once done (washed out since I've yet to find a bottle brush that fits into the opening)...
I would suggest getting some of the bottles you're interested in using. Give them a try and see how you like them...