You should start at the opposite end to the door as the gap in the door helps to get the last sheet in to place.
Make sure you add two bolts to each joining bar as you go as long as there is no danger of any wind its best to only hand tighten the nuts.
The sheets are machine cut if you greenhouse is square and level all the sheets should line up with the channels.

The sheet needs to go up in to the ridge until it drops in to place an the bottom its a tight squeeze.
Once its inline in the bottom the sheet need to be pulled back down in to the lower channel.

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