Read all the window trimming tips from some of our favorite DIYers below and then come back later today for more All Things Windows goodness (see everything so far here). (And you can share your projects using #AllThingsWindows on social media and link up your window-related blog posts or Instagram photos at the party, too!)
DIY Window Casing Tips + Tutorials
First: head over to This Old House and read this awesome article that tells you all the terminology about what is what in window trim. Very informative!
Over at Pretty Handy Girl, Cristina from Remodelando la Casa has a thorough and detailed window casing tutorial to get your from start to finish — how to remove a window sill, install a new one, and trim the window for a full makeover. 
Ashley from Make It and Love It also shared a great informative tutorial about how she (a self-proclaimed DIY rookie) replaced window sills and trimmed her windows. 
If you're looking for an easy carved moulding style trim, check out this tutorial by Ana White.
Or if you're in the market for the craftsman look, The DIY Mommy shares the tutorial for how she did a super easy craftsman-style trim (by herself!) — just 4 pieces for each window!
Over at Teal and Lime, our very own Kayla and Justin from Home Coming shared all their carpenter's tips for installing a craftsman style window trim. 
Donna from Funky Junk Interiors also used a craftsman style window trim in her home, but she used regular flat lumber (not crown moulding) to create the stacked crown on top.
Sarah (aka Thrifty Decor Chic) shows you how she added window trim and updated her chair rail to have a seamless transition from window casing to existing wainscoting.
Jill from The Rozy Home shared here on Remodelaholic how she took her entryway style up a notch by trimming out her arched windows.
Visit Thistlewood Farms to see how KariAnne used plywood to save money while adding height to her farmhouse windows.
If you've got a set of windows to trim, head over to Remodelando la Casa to see how Cristina installed trim on her double window.
Brittany, the amazing Pretty Handy Girl, shows you how to frame a casement (hinged) window.
Phew. There ya go. I'm breaking a sweat just thinking about all the measuring, but the work of framing windows is totally worth it!
UPDATE: In response to a question from Melissa, we also want to add this awesome tip from House of Hepworths: how to add window trim to a rounded corner.
More great window ideas
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Thanks so much for sharing my window trim tutorial. We’ve lived in our new house for over a year now, and I still love my simple DIY trim! Have a great week!
You’re welcome, Christina!
Any suggestions for round corners? I have always wanted to trim my windows, but the corner bead is round 🙁
Hi Melissa! Thanks for the question. Try this method from House of Hepworths — and I’ve also added this to the post since I’m sure you’re not the only DIYer afflicted with rounded edges 🙂
I recommend window frame decorations in Molding Creator, high quality very good prices and durable elements.
inspiration hit like a bolt of lightening on trimming out my bay windows. Have totally been stumped by all of the you tube explanations for the compound miters on the header. Hoping that I will receive some simplified guidance for overcoming this huge obstacle. Sigh.
Excellent info!