I think you will be surprised how steep of a slope you're ok on, though I wouldn't advocate trying it out. Over time you'll gain confidence and get a better sense of the slopes. Anytime you can go up / down vs across is really much safer. I have an extreme slope down to my waterfront, and in general my land is pretty hilly. I found out the hard way how much the tractor can take within a few hours of ownership. I accidentally had it in 2wd on a steep slope, lost traction going down, slid out of control, lowered the bucket to prevent going into the ice covered lake, spun in a 180 on a very steep slope and stopped without tipping. It was not a gentle spin, it was quite violent and I believe a rear wheel came slightly off the ground
Some observations I've had are that the BH changes stability DRASTICALLY, I am very careful with the BH on, but without it can go in some pretty steep areas without serious concern. After a year of use I drive on steeper areas and have a better feel. Areas I thought were dangerous at first I now have no concern with. I think that you'll find it will handle a lot more than you think, but drive around, get practice and be careful. The advise about ruts and holes is good advice. You can get tire spacers, I haven't found that I needed them though. You can measure the slopes if you're concerned to get a sense of what the machine will take as well. Attachments change your center of gravity a lot, so get a feel for them before operating on slopes. If I get a chance tomorrow I'll post some of the steepness of the slopes I operate on to give a sense...