Even without money and a winch it can be done and there are free courses out there that will teach some of the techniques and pitfalls..... but you need to go get them they do not come to you [not for nothing anyway].
For the police [though not exclusively] the source of this rich vein of people who have been there made all the mistakes and have many of the answers is within the Airborne Law Enforcement Association [ALEA].
This is an international grouping of like minded policemen who will tell you how it is in their eyes [even if you may disagree] and I encourage them to come to Europe to tell their varied tales of things that little is known off. This year one of the presentations given in Prague was 'How to.... ice rescue....' presented by someone who has seen lots of ice and has therefore had many chances to make the mistakes and put them right. Another was high rise rescue....
With RAF SAR [the experts] on the wane is it not time to learn from others?
The problem is getting the [police air support] horse to the water....