For great painted woodwork, good surface preparation and good brushing technique are essential. Like any DIY job I recommend spending time and effort getting it done right first time to avoid a shabby finish.
In particular an article I would recommend for Painting; https://www.familyhandyman.com/painting/techniques/10-interior-house-painting-tips-painting-techniques-for-the-perfect-paint-job/
Obviously if you would rather leave the fuss and hassle to a professional then give me a call today for a free quote.