Its do-able but Plan carefuly and keep your costs down -
You may make more money out of fewer sheep spread thinner on the ground than more, and having to buy in food
The trick small scale is the same as the big boys - Maximise your useage of good grass. Rotate pasture, use the right mineral licks and minimise feed brought in - Grass grows free mostly, Its better to spent £25 an acre on clover seed to increase the quality of the grazing than it is to spend £25 on ewe nuts for a small flock for a week.
It will also last longer!
From 30 sheep managed well, lets say Mules put to an easy terminal sire, no reason why if you had 8-10 acres of average ground you should not make £1500 operating profit, selling butchers lambs - Ignoring the cost of starting the flock.
You could make more if you bred Pure beltex of texels etc....
Less if you feed them ewe nuts every week.
Maximise your grass quality and usage and you will save