Confidence in beating the enemy would undoubtedly have been high until Isandlwana (as has been mentioned). But morale was another matter and would also depend on how long the different regiments had been in the Cape. The 80th Regiment for example were there during the Sekukuni and Zulu campaigns 1877-1879. This quote from an interview with Sergeant Anthony Booth V.C.gives some idea of conditions which would have affected morale:
[i]We arrived about five miles from his stronghold in October, marching from 21 to 30 miles a day, crossing rivers by marching through them belted and fully dressed. In fact, remarked the gallant soldier, from the time we left Natal in June, 1878, till I arrived in Cape Town in April, 1880, I did not take off my boots and clothing at nights, but slept in them with the rifle at my side[/i].
This together with a rather monotonous diet and dreadful weather conditions would not have done much for my morale!!