Thank you everyone who advised!
We put it up this afternoon. It took slightly less than the recommended time- even for us first timers so it must be easy to erect . It is massive, just the right size to not get clostraphobic (sp?)- only just fit in our garden (no guys), and feels really well made and sturdy (fingers crossed). We had neighbours coming round for a tour before we'd even finished! I love it, we all love it, I'm absolutely thrilled. [does a little dance]
just can't wait to go camping now