Step0: Select the simplest achievable task in the domain of the new thing you are trying to learn.
Step1: Gather all the stuff you think you will be needing to accomplish the task (tools, materials, software, instructions, time!, etc).
Step2: Hit a road-block. It can be the lack of an indispensable tool or a lack of knowledge of a particular detail.
Step3: Fix the blocker (fill the knowledge gap about the new detail, buy/borrow the missing tool). If multiple roadblocks: Solve the one that seems most fundamental first; If stuck at blocker: seek help from others, sleep on it, give up (some things are too hard with your present knowledge).
Step4: If task still not completed GOTO Step3; If task completed: Select a new more advanced task and GOTO Step2.