OP, welcome to Polite Society.
As others have said, there are many common themes regarding concealed carry. Carrying a defensive tool is meant to be comforting to the carrier, not necessarily comfortable. Your level of comfort is dependent on several factors, including a good (gun)belt, a holster that keeps the gun situated in a manner you can access it easily and clothes that allow for your chosen belt/holster to work with them.
Regarding the Belt, many have made comments and recommendations. A good gunbelt spreads the weight of the gun over a wider area around your hips and keeps the holster more stable. Beltman and AG Gunleather, among others, produce quality leather gunbelts. The Wilderness 5-stitch Instructor belt, or similar belts by 5.11 and others provide similar support using Nylon webbing.
There are many makers of fine holsters these days -- something that couldn't be said not that may years ago. For general everyday inside the waistband comfort and concealment, I settled on a hybrid holster (leather and Kydex) -- the Comp-Tac Minotaur MTAC -- years ago, and it serves me well to this day. More recently, I purchased a StealthGear holster for a different gun that has a composite material rather than leather as the backer. It still remains somewhat flexible but rigid enough to consistently allow for holstering without concern. Most folks will recommend all Kydex holsters since they do not flex at all for safety reasons. I can't argue this point, and that is why it inspect my holsters regularly to ensure that if there are potential safety issues cropping up I know about them and can take action of mitigate them.
Most folks who chose to carry concealed settle pretty early on belt/holster combos and then dress around them. If you chose an inside the waistband holster, you'll need to consistently have pants that allow for a holster inside without constricting too much. If you carry outside the waistband, you'll need shirts with plenty of tail to ensure concealment. In any case, you'll need pants with beltloops to support the wearing of the gunbelt.
Where about your waist you choose to carry is a very personal thing and your holster choice will somewhat follow. Different body types and weights will have different places that the gun tucks into more easily. AIWB holsters will be more upright or vertical (bore/slide) than will holsters carried to your side. As I said before, a large number of manufacturers are making a variety of different, quality holsters these days, including holsters with level II or level III retention mechanisms (predominantly for those who wish to open-carry.
Regardless of your choices in gun, holster, belt, clothing and where to carrry, safety should always be paramount. The first rule of firearms safety is to ALWAYS keep the muzzle pointed in a safe direction. Toward any body part is NEVER a safe direction. So, holstering should always be done with care that you don't direct the muzzle of the gun toward any body parts during the re-holster. I love the statement "nobody ever won a gunfight by being the first one with their gun back in their holster". AIWB requires particular care when re-holstering since things like the femoral artery are right there and we certainly don't want to be poking holes in that. Most folks will need to pull their strong-side leg back when re-holstering AIWB to avoid this very thing. I practice holstering and drawing with an empty gun (or with snap-caps) in front of a mirror, paying particular attention to where the muzzle is oriented so that I engrain habits that will not be unsafe. Additionally, where possible, I holster the gun, then put the holster(with gun) on.
When holstering, the other thing to be careful about is the bang-switch. As the gun travels down into the holster, anything getting in the way of that travel -- clothing, accessory, holster flap, etc... -- could actuate the trigger, causing a very loud noise (and potentially a lot of other undesirable consequences depending on how well you follow Rule #1). Ensure that your clothing is out of the way and that the holster is in good repair, and, when possible, visually observe the area as you are re-holstering.
Good luck and stay safe.