This isn't an imposible diy job, but you'll need some specialist kit like the hub nut socket,also known as a 52mm box spanner, as mentioned you may get away with just tightening the existing bearings, but a new set will give peace of mind.
First things first make sure vehicle is securely supported, there'll be a lotta hammering going on, always best to place secondary support under vehicle like the wheel itself with some timber to pack out.
Also worth having some bearing puller's if you are going to change as they can be a right pita to remove sometimes. you'll also find a selection of cold chisel's and lump hammer handy bits of kit to tease things on there way. removal of the old bearings is always the hardest part. using a blow lamp can sometimes help to loosen there grip.
Once removed refitting is pretty straightforward, after greasing, tighten the hub lock nut all the way turning the hub as you go, until it won't turn anymore, then release the hub nut by quarter of a turn or until the hub turns freely with no excess play. always check all washers and locking shims are in place first.
another handy tool is a G clamp for pushing the brake pistons back into the callipers, remembering to slightly loosen the bleed screw to release pressure as the piston goes back in. somtimes just removing the brake fluid refill cap is good enough.
Finally this time of year you may need use of a garage or shelter to do all of the above.
Best of luck.