@BEC111: There is a simple trick how to reconnect the chain without any tools. Place both chain ends at the top. Temporarily remove the chain from the chainring, so the chain is loose. Apply the master link then delicately place the chain back on the chainring. Rotate the crankarm backwards and place the drive-side pedal in 2 o'clock position. Now, apply a violent kick to the pedal from the top and voila, the master link is reconnected!
Now, foofer is right you need a big chain breaker and chain pliers. Let me share some thoughts.
Not sure what kind of magic works for you but 4,000 miles would mean at least two chain replacements for me (with the 10-speed system). It might turn out your new chain would be skipping on the cassette cogs despite what you think. The chain pliers are needed for advanced maintenance of the chain. Here is what we call "chain shaking". Once in a while, I disconnect the chain and place it in a jar (together with the master link); my favourite jar is a big Nescafe one

Then I pour proper chain cleaning liquid, close the jar and give it a long violent shaking. It washes most of grim from the chain rollers. Then I wash the chain in running water and let it dry. Finally, I reinstall the chain using the pliers and apply the chain lube to each roller individually (I do it with the e-bike rotated).
I re-use the liquid next time as the dirt has sedimented in the jar before the next chain shaking.
The above keeps my chain clean and lubed. Of course, the pliers are important for me, too. As I own two e-bikes, I might do as many as four chain replacements a year. so the big chain breaker and chain pliers are important tools in my arsenal.
I wrote the above to give you more information. If you elect using your shop for the chain maintenance, please do it. (I myself like to be in the control of my e-bike maintenance).
Cheers!
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