Professional collaboration is just a matter of coming to terms with one’s weaknesses and asking others for help. The concerns are twofold: bugging people and not retaining the information. If you’ve done sufficient research – at least five minutes on the topic – then it’s perfectly acceptable to ask about a question, even if it’s very similar to what’s come up before. It’ll help reinforce the knowledge. Just recognize when people are busy and not. Most people don’t mind helping if they’re not busy, so be polite, and write everything down or recreate it later. Don’t be afraid to ask for help!