Shorter courses can be arranged for those who are already indexers but who need help with computer indexing. The cost depends on the amount of tuition required. N G Indexing is hard work. It takes considerable concentration, a clear and logical mind and an ability to see the connections between topics. Books on gardening, cookery, travel and similar topics are often indexed by the author or 'in house' by the publishers.
Indexing also requires an ability to work fast.
The index is compiled at the last moment when the final proofs become available. You are likely to be asked to complete an index in two to three weeks or less. To do this you have to set aside many hours a week for very strenuous work. As a beginner you would obviously take longer to create indexes. The BIPT course sets no deadlines but it would be wise to set your own as a discipline.