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Common tools include spike aerators and core aerators. Professionals often use motorized equipment for efficiency.

There are a few time periods or conditions during which you should avoid aerating your lawn. For example, do not aerate when the ground is frozen or waterlogged, as it can damage the soil structure and grass roots. Aerating during the peak of summer heat or drought is also not recommended since it can stress your grass further. It's best to wait for cooler, more favorable conditions. Finally, newly seeded lawns should not be aerated until the grass is well-established, usually at least one year after seeding.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Overseeding after aeration is not always necessary, but it can be highly beneficial, especially for lawns with thin or patchy areas. Aeration creates an optimal environment for new grass seed germination by improving soil contact and reducing competition from thatch. If you aim to thicken your lawn, address bare spots, or introduce a new grass variety, overseeding immediately after aeration can help rejuvenate and enhance your lawn's overall health and appearance. However, whether you overseed or not depends on your specific lawn goals and condition.