Staz, the writer of the minis are also market makers, they will have a prescribed buy/sell price. That price is on a formula to the buy/sell of the stock. The volumes are also dependent on the first line of the stock concerned.
So the short answer is, no, the mini will not be hard to sell. BUT.
As minis, moreorless, move up/down cent on cent with the stock, if you sell your mini and buy another one closer to exercise price, you may be able to buy more minis at a cheaper price with the same value of money. And because minis all more or less move the same you effectively increase your exposure both ways. But don't forget when you get closer to ex. price you also get closer to stoploss price. Further remember not all minis have a stoploss pricewritten in them. Some expire worthless if stoploss price is reached.
If you wish to keep same exposure, and take some profits, what you can do, if there is other similar minis closer to price is sell higher value and buy same amount of lower values and keep the difference. BUT remember, not all minis have stoploss value so the cheaper ones, nearer the stoploss price need to be monitored more closely if they retain no value.
