Well done that Gal!
As Snows says, an electric machine may cost just a few quid more, but are really well worth it!
Mine is three years old, and I did about 18 miles the other day, all over the place, and it really was a grand hour and a half! The hills around here are dire in places, so I hope you have an easier ride, but the interchange between using the 'assist', and the normal 7 speed Shimano gears is just great fun!
And while you're looking at a trike, they kick in at around a grand, but you may be able to pick one up second-hand!
'Goferit', and ask away if you have any queries!
(and always wear a helmet..:0~