If you wish to ensure that you are able to use the Creation Kit without interruption, just about now might be the right time to set your Steam client in offline mode and keep it there.
That makes certain that once 1.8 goes out of beta, you can avoid being automatically patched to it. After previous patches, there has always been a number of gamers, who have been "surprised" by a patch, that has made some of their mods incompatible with the freshly patched game. This time the 1.8 patch makes Update.esm incompatible with the current Creation Kit, effectively preventing one from using it at all, if one has Update.esm as a master to one's mod as one usually should. So, unless you have strong faith in Bethesda updating the Creation Kit immediately after 1.8 goes live, you might consider taking this simple precautionary step to avoid a compulsory break of unpredictable duration in CK availability.
P.S. And sure, there may be other ways to achieve the same (including removing Update.esm as a master, which is of course possible though perhaps not good practice), but going offline in Steam is pretty straightforward. The Steam setting "Do not automatically update" will not do the trick, as it merely postpones updating until you launch the game to test your mod.