I recommend that you visit this link and sort out your JVM Arguments. Also, allocate as much RAM as you can feasibly allocate. Ya don't want crap-tonnes of stutter d-d-do y-y-you?
Install Praisekek
Step 1
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Step 2
Type in the modpack name (Praisekek) or paste the following url into the search box.
Step 3
Finally, click Install at the bottom right of the launcher after you select Praisekek from the list on the left. The launcher will handle everything else!