Hope this helps you:
I have written several blog posts to help out with installing molding on your own. I put the links below. Have fun!
Here's another helpful link!
You should get a compound mitre saw to make the cuts. Make practice cuts before trying to install. Once you put it down, attach with finishing nails and fill cracks with caulking.
Here's several ideas:
Depends on the type of molding that you're looking for. You can use 1x4s and can make straight cuts for a more simple look that will be much easier to do. Or you will need a compound saw of some kind to make angle cuts.
The how will depend on what style/type you want. You can do a simple framing that requires no cut except length, but anything more elaborate will require precision cutting for a nice aesthetic
here is a tutorial and video on installing wainscoting type molding https://www.charlestoncrafted.com/easiest-way-to-install-diy-wainscoting/
There are lots of molding ideas here:
Are you referring to crown molding or baseboards?
Here's a neat trick for corners if you don't want to cut mitered corners. https://www.exquisitelyunremarkable.com/2015/09/decorative-corner-blocks-and-moulding.html
Anna: maybe this will help
Hi Anna: Are you talking about ceiling or floor molding? It's really a matter of cutting to length and using finishing nails to attach it. If you are going to miter the corners, buy more molding than you need and practice cutting inner and outer corners. A lot of practice. Note how you put the molding into the miter box, too. You can put different sizes of molding on top of another to make a profile type look. Or, you can just buy the look you want. Some is paintable. The nails come in different colours, and be sure you nail into the floor or wall, not where they meet, otherwise you will be nailing into the air :) It's not that hard at all, you can do it. I have faith in you! Good luck
Where in your room? Timber or plaster or plastic moldings?