This is an amazing little video of how the JWST will be inserted into a Halo orbit at L-2, a million miles from Earth, in about 29 months. This will be the largest space telescope ever inserted and will not only dwarf Hubble, but far exceed its capabilities.
When it is launched, it will be the largest single payload ever launched by an Ariene V, and will require the largest payload shroud ever built.
Watch this one full-screen, and bookmark it. You'll want to check it out repeatedly.....
https://www.youtube.com/user/NASAWebbTelescope