1. You do not like to spend time with your children.
Seems like a no-brainer, right? But if you don't like being around your children, then homeschooling will be most difficult for you and probably not good for them either. Before you attempt homeschooling, spend time in prayer and study, asking the Lord to turn your heart back to your family, from wherever it has been drawn instead. And perhaps seek the help of a counselor. Spending time with your children should make you happy. It should be a source of JOY. At least most of the time.
2. You don't want to change anything about your present lifestyle.
This might not seem quite so obvious, but homeschooling is a huge change of lifestyle from what most people are used to. It requires flexibility, sacrifice, and dedication. It requires time, finances, effort, and prayer. If you are not willing to give it your all, then you should probably look at other options for educating your children. However if you are willing to go all in, you will find there are great rewards to living a homeschool lifestyle. (see lists of Reasons to Homeschool here, here,and here)
3. You think you should homeschool because your friend, neighbor, sister, pastor is homeschooling.
If you start homeschooling because you feel guilted into it or pressured into it because people around you are homeschooling, then you are going to struggle. It is not enough just to think it might be a good idea. You must believe in your own heart that this is the BEST choice for your family. You will face opposition at some point - from extended family, media, the church, friends, strangers. You will doubt yourself and wonder what in the world you were thinking! How will you respond?
4. Your husband or wife is strongly opposed to the idea.
You never want homeschooling to put a wedge into your relationship with your spouse. Spend time researching, discussing pros and cons, visiting other homeschooling families. Pray for unity. A strong marriage is the foundation for a strong family and is vital for the success of your homeschool. If you are a single parent, you are in a different situation, and I believe the Lord provides grace to compensate for the missing parent.
Homeschooling is the easiest, most natural thing in the world. You have been your child's teacher from birth; you can continue to learn right alongside your children throughout their childhood all the way into young adulthood.
Homeschooling is the hardest, most challenging thing you will ever do.
No one knows and loves your child like you do, or wants more for their future.
No one can drive you crazy like your own child! He knows all the "buttons" to push and will challenge you and push the boundaries.
Homeschooling provides a flexible schedule, which allows you to work lessons around other activities, take days off when you want to, do volunteer work, etc.
There are not enough hours in the day to fit in everything you and your child would like to do. Be very careful to guard your time at home and be mindful of how much activity your family can handle. Set priorities for this season in your life. Learn to say "No" for now to those things that do not line up with those priorities.
We are blessed to live in a time and in an area with so many opportunities and resources available for homeschooling families. There are support groups, classes, co-ops, sports teams, debate teams, choirs, bands, seminars, clubs, camps. There are online classes and curriculums. There are companies selling every imaginable book, game, program, or tool you might want.
All these things have a COST in money and time. A homeschool family's budget gets stretched mighty thin. There are always choices that have to be made. Guard against DISCONTENTMENT with your financial situation. The homeschool community is great at sharing resources, and homeschoolers are known for their creativity, cooperation and ingenuity when it comes to seeking out and creating affordable opportunities for their families. Really consider what are NEEDS versus WANTS.
Here is another post of reasons not to homeschool, by one of my favorite homeschool bloggers/speakers/authors, Heidi St. John.
Another well-know blogger/author, Ree Drummond, aka The Pioneer Woman, has posted her 3 reasons not to homeschool here.
For a list of 50 Reasons Why Homeschooled Kids Love Being Homeschooled, check out this post by Kris Bales at Weird, Unsocialized Homeschoolers.