Thanks for the tips, Paul!
Fortunately, the rose bushes are still flowering, so I tried again today. Flowers were mostly up high and in a bit of a ditch, so I needed both hands (one for holding on, other for harvesting). I took pictures from a bit further away where there was some level ground--hopefully you can see where I pulled down the rose branch and removed some flowers!
Rose tea from rambling roses. Did a better job this time as the
water needs to be warm but not too hot, or the delicate rose flavour gets destroyed. Yum!