Should I be constantly checking prices or is that counterproductive for a beginner holding strategy? I already check way too much.

Checking prices constantly is probably the most destructive habit you can develop. Price movements on short timeframes are basically noise. Set yourself a checking schedule, maybe weekly or monthly, and automate what you can. Every daily check makes you more likely to make emotional panic decisions during normal volatility.

Checked my portfolio compulsively for first year and it made me miserable without improving results even slightly. Switched to monthly reviews only and my sleep improved dramatically while returns stayed same. The volatility is still happening, I just don't watch every fluctuation now. This changed my entire approach: https://ekripta.com/en/3k-investment/ Really focuses on behavioral aspects.