I'm with Aviendha on this. Do a full install and the load time is faster plus you'll only need the TOB disk when playing.
I also would recommend installing the respective patches for both games from the BioWare official site and then also get the Baldurdash Fixpack at
http://members.rogers.com/mrkevvy/
or you can go to the Sorceror's Place
http://www.sorcerers.net/Games/BG2/index_editors2.htm