So glad you've taken up spinning - it's truly changed my life. I've been spinning for almost a year now and it's my favourite of all the cardio workouts. It even led me to get an outside bike and I will be racing soon...and believe me, that's a long way from where I started!
It doesn't start off hard unless you make it that way. It's your workout so when your instructor tells you to add resistance or stand up, it's all optional on how much you do just those things. Some days you may feel like adding more than others; same with standing.
My advice is to not judge your experience by the first day - it does get less intimidating...and to use a gel seat if you need to. I didn't but a lot of spinners like them, especially when they're starting out. I would make sure you're fit on the bike - your instructor or fellow classmates can help with that if you need them too - and just have fun! I visualize specific hills and rides as I'm going along too.
Along with drinking plenty of water - even if you don't think you want to - I would try a bit of strength training if you're not already. I found it really helped my core muscles (duh!) and that way I could get into more of the positions when I'm standing for the climbs.
Hope that helps - looking forward to hearing more about your spinning adventures!
To thine own self be true
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