Don’t take a 401K loan
401K loans are fairly easy to get from a plan. There is no credit check because the loan is basically secured by cash. You can usually request online and have the money deposited directly into the bank account. You can pay them back on a schedule with payroll withdrawals.
The reasons not to use them are simple. If you leave your employer the loan is due in full. Otherwise you have to take the balance as a withdrawal and pay taxes and penalties on it. This may also apply if you are fired or laid off.
You pay interest to yourself. While this sounds good, the money might do better in the market. You also tend to keep the money out of the market for long periods. The interest you pay is not tax deductible. it is best to finance purchases by other more traditional means.