How hard is it to replace a head gasket on my own?

I have a 2005 Honda Accord EX 4 cylinder and have been getting bad misfires & used to have white smoke coming out the tail pipe but i put KW sealer in the radiator and it was a temporary fix, I've driven about 500 miles since but now I'm having really bad misfires again.

I've already replaced the spark plugs but I'm still having the issue. I believe it's a bad head gasket & i can order one but don't have 1,000 dollars on hand to pay a mechanic to replace it so i want to do it on my own but have no experience, but I'm extremely willing to learn.

Can anyone give me any tips or advice?

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