We recently had a review of the Vango Amazon 600 posted by the nice people at The Tent Factory which included instructions on how best to pitch a steel framed tunnel tent. In case you missed it I have copied and pasted here:

1. Lay the tent out on the floor without the canopy attached and peg the four corners with large pegs (buy extra pegs when purchasing your tent) making sure any adjustable straps are nice and slack.
2. Open the two side doors and go inside the tent to get some air inside.
3. Slide one roof bar through the pole sleeve by the side doors (middle roof pole sleeve) then place a leg on either side and connect to the roof bar and lift. As you lift air will be allowed into the tent making it easy to lift.
4. Make sure the tent fabric has not been caught etc and place the pins which are attached to the groundsheet into the bottom of the pole, remember all the adjustable straps should of been slackened off allready. Once the pins are in the bottom of the legs gently pull the adjustable strap until the strap is taught, but not over tight.
5. Repeat number four working one at a time out to the back then to the front of the tent. If the weather is breezy then close the middle doors and guy each leg and roof bar as you go.
6. Finish of all the pegging and guy ropes.

This way of piching will work with most steel framed tunnel tents such as the Outwell Vermont range, the Outwell Montana 6 tent. the Khyham Cleveland 6 and tents like the Kampa Lulworth range etc etc...