It depends. Smaller, younger trees take longer to mature, but they're more resilient, their roots don't get as damaged during transplanting, and they recover faster. Plus, they're much more affordable to plant, and it's possible to DIY the planting. 

On the other hand, mature trees produce fruit faster and provide more shade and privacy immediately. Ideally, a small or medium tree is the better choice if you can wait a few years for it to mature. But if you need immediate maturity, a larger tree is the only option.

The speed of your tree root removal process depends on a few different factors, including the size and type of tree. However, the fastest method of killing tree roots is applying chemical herbicide, which starts working quickly and efficiently. But this removal method has its drawbacks, such as having a negative effect on the surrounding vegetation and landscaping. Other options like rock salt and stump grinding work relatively quickly and cause less damage to your yard.

It is possible to cut down a tree on your property yourself, but it is generally not recommended unless specific conditions are met. You should only consider this project if the tree is small (e.g., under 4-5 inches in diameter and short enough that you don't need a ladder to reach the branches), and you are experienced in handling a chainsaw. The tree must also be located far from any power lines, fences, homes, or other structures. Even for small trees, the work can be dangerous, and it's always advisable to have a spotter to ensure the tree falls correctly and no branches fall on you.

For any tree that is large, requires a ladder to access, or is near electrical lines or structures, you should always hire a professional. Attempting to remove a large tree yourself is extremely dangerous, poses a risk of serious injury, and could result in significant damage to your property.

Before any tree removal, it's also important to check your local and state regulations to ensure the tree is not historic or otherwise protected by your city.

Yes, forestry mulching can grind stumps, but the level of effectiveness depends on the equipment used. Drum mulchers can break down smaller stumps, but larger or deep-rooted stumps may require a dedicated stump grinder for complete removal. If full stump removal is necessary for replanting or construction, additional excavation may be needed. Always check with your forestry mulching provider to confirm whether they offer stump grinding and if their equipment is suitable for your specific needs.